OPINION OF THE COURT
EAGEN, Justice.In this case we are directly confronted for the first time with the important question of whether, in Pennsylvania practice, a plaintiff, whose attorney files a praecipe for a writ of summons to commence an action within the time period permitted by the statute of limitations, instructs the prothonotary to issue the writ but not deliver it to the sheriff for service, and then has the writ reissued and served after that time period has expired, is barred by the statute of limitations from continuing the action.
On September 1, 1967, plaintiff-appellant Frances Lamp allegedly was injured when her car was struck from the rear by a truck driven by defendant-appellee Heyman. On August 28, 1969, within the two-year period permitted by the statute of limitations for the bringing of an action to recover damages for injury wrongfully done to the person,1 her attorney filed in the Court of Common Pleas of Beaver County a praecipe for a writ of summons in trespass against the defendants, but because of his instructions to the prothonotary the writ was not delivered to the sheriff’s office and consequently was not *470served.2 On April 9, 1970, a praecipe for the reissuance of the writ was filed together with a complaint endorsed with the notice to plead. Again no service was effectuated, and this time the record does not indicate the reason. On June 4, 1970, another praecipe for reissuance was filed, and service was finally effectuated on June 19, 1970. Subsequently, defendants filed preliminary objections in which they asserted that the original summons was a “nullity” because of plaintiff’s “issue and hold” instructions to the prothonotary, and that the action was therefore not brought within the two-year period provided by the statute of limitations. The defendants also filed a complaint against additional defendants, who then filed an answer and new matter raising the statute of limitations as a defense. The plaintiff replied to this new matter and admitted that the “issue and hold” instructions had been given to the prothonotary. On February 16, 1974, the trial court sustained the original defendants’ preliminary objection in the nature of a demurrer and entered judgment for the defendants.3 On direct appeal the Superior Court affirmed in a per curiam order without opinion. Lamp v. Heyman, 231 Pa.Super. 776, 331 A.2d 553 (1975). We granted allocatur.
Initially, we observe that under Rule 1030 of the Pennsylvania Rules of Civil Procedure the bar ° of the statute of limitations is instantly an affirmative defense to be raised as new matter in a responsive pleading, as was done by the additional defendants, not by means of preliminary objections in the nature of a demurrer. *471Compare Pa.R.C.P. 1017(b) (4), not here applicable. See Royal Oil & Gas Corp. v. Tunnelton Mining Co., 444 Pa. 105, 282 A.2d 384 (1971); Ziemba v. Hagerty, 436 Pa. 179, 259 A.2d 876 (1969). Since, however, appellant has not objected to the issue being raised by way of preliminary objections either in the trial court or on appeal, and since the additional defendants did raise the issue as new matter and appellant then admitted the underlying factual allegation, we proceed to a determination of whether appellant is indeed barred by the statute of limitations from continuing her action. Cf. Yefko v. Ochs, 437 Pa. 233, 236, n. 1, 263 A.2d 416 (1970); Goldman v. McShain, 432 Pa. 61, 247 A.2d 455 (1968).
Pa.R.C.P. 1007 in pertinent part provides: “An action may be commenced by filing with the prothonotary (1) a praecipe for a writ of summons. . . .” This Court has repeatedly held that, pursuant to this rule, the mere filing of a praecipe to commence an action is sufficient to toll the running of the statute of limitations and that, although Pa.R.C.P. 1009(a) provides that a writ shall be served within thirty days after issuance or filing, it may, pursuant to Pa.R.C.P. 1010(a), be reissued at any time after the original issuance during a period equivalent to that permitted by the applicable statute of limitations for the commencement of the action; further, each valid reissuance gives rise to a new equivalent period during which the writ may again be reissued. See, e. g., Ehrhardt v. Costello, 437 Pa. 556, 264 A.2d 620 (1970); Salay v. Braun, 427 Pa. 480, 235 A.2d 368 (1967); Zarlinsky v. Laudenslager, 402 Pa. 290, 167 A.2d 317 (1961). Thus, in the instant case, it is clear that if appellant validly commenced her action so as to toll the running of the statute when she filed her praecipe on August 28, 1969, her action is not barred by the statute of limitations, since she effectuated service of a writ reissued well within two years from both the date when she filed her original praecipe in August and the date *472when she had the writ reissued the following April. The trial court, however, in sustaining appellees’ preliminary-objections held that appellant nullified her apparent commencement of the action by the “issue and hold” instructions her attorney gave the prothonotary, since these instructions had the deliberate effect of frustrating timely notice to appellees that an action had been brought against them.
We note that it has become a relatively common practice throughout the Commonwealth for attorneys to file a praecipe with the prothonotary to toll the statute of limitations but then, whether because settlement negotiations are in progress or because more time is needed to prepare the case, to delay or prevent service upon the defendant. Depending upon the process obtaining in a particular county, this can be accomplished by instructing either the prothonotary or the sheriff to hold the writ, by personally retaining the writ and not delivering it to the sheriff for service, or by neglecting to pay the sheriff his fee. It is clear that the various courts which have been presented with the question have reflected a wide division over whether such action, or inaction, on the part of the plaintiff should be deemed to nullify the effect of the original filing. See generally Brua v. Bruce-Merrilees Electric Co., 63 Pa.D. & C.2d 652 (1973), and cases cited therein; 1 Goodrich-Amram, Standard Pennsylvania Practice, § 1007.3 (Supp.1976). The consequence of such division has unfortunately been to undermine the uniformity of practice and the predictability of result envisioned by this Court when it promulgated Rule 1007.
Pa.R.C.P. 127 sets forth the following provisions pertinent to the construction of Rule 1007:
“(a) The object of all interpretation and construction of rules is to ascertain and effectuate the intention of the Supreme Court.
*473“(b) Every rule shall be construed, if possible, to give effect to all its provisions. When the words of a rule are clear and free from all ambiguity, the letter is not to be disregarded under the pretext of pursuing its spirit.”
Applying these standards to Rule 1007, we conclude that neither the language of the rule nor our decisions interpreting it permit us to hold that appellant’s “issue and hold” instructions to the prothonotary upon filing her praecipe nullified the commencement of her action and caused it to be barred by the statute of limitations. We accordingly reverse.
The language of Rule 1007 is clear and unambiguous; it does not admit of qualification in an effort to ascertain its spirit.4 Indeed, its underlying purpose has been to provide certainty as to the commencement of an action and to remove a subsequent failure to effect service from consideration in determining whether the statute of limitations has been tolled. In the words of one authoritative commentator:
“Under the prior practice, there were differences of opinion respecting the date when an action has been ‘commenced’ by the plaintiff within the meaning of the Statutes of Limitation. The alternatives included (1) the date the plaintiff filed his praecipe; (2) the date the prothonotary prepared and issued the writ; (3) the date the writ was delivered to the sheriff for service.
“Rule 1007(1) clarifies any doubts with respect to the prior law. The action is ‘commenced’ by ‘filing with the prothonotary a praecipe . . .’. This makes it clear that this action by the plaintiff is all *474that is required of him. Failure of the prothonotary to issue the writ, failure of the plaintiff to pick the writ up, or failure of the sheriff to receive the writ for service are all irrelevant, so far as tolling the statute is concerned. By the mere filing of the praecipe, the action has been ‘commenced.’ ” [Footnotes omitted.] [Emphasis supplied.]
1 Goodrich-Amram, Standard Pennsylvania Practice, § 1007.3 at 22.
In Salay v. Braun, supra, 427 Pa. at 484-85, 235 A.2d at 371, we described the nature and scope of the rule in the following terms:
“Rule 1007, PaJR.C.P. [12 P.S. Appendix], specifically provides that the action is ‘commenced’ when the praecipe is filed, irrespective of whether the prothonotary issues the writ or the sheriff serves it. This is the deliberate intent of the rule, to free the plaintiff from the risk that the statute of limitations may bar him if he acts in time, but someone else fails to act in time.
“The Rule in Pennsylvania has always permitted a plaintiff (even under the alias and pluries writs of the old practice) to commence an action and keep it alive until he suddenly serves the defendant. See Zoller v. Highland Country Club, 191 Pa.Super. 207, 156 A.2d 599 (1959). But this, of course, has always been protected from abuse by the doctrine of non-pros for unreasonable delay in prosecution.” [Emphasis in original.]
In its opinion sustaining appellees’ preliminary objections, the trial court in the instant case cited our observation in Salay that the intent of the rule is to protect a plaintiff who acts in time though someone else does not, and it concluded from this that its purpose is not to protect a plaintiff who deliberately prevents the writ from *475being served. This is not the purpose of the rule, but Salay made it clear that a plaintiff who filed his praecipe in time acted in time to toll the statute, and that the remedy for a defendant prejudiced by the plaintiff’s abuse of the rule was not in the statute of limitations, but in the non-pros doctrine.
Appellees, however, point to Peterson v. Philadelphia Suburban Transportation Co., 435 Pa. 232, 255 A.2d 577 (1969) as authority for the proposition that this Court has specifically ruled a hold order by the plaintiff which prevents service of the writ makes the filing of the praecipe a nullity for the purpose of tolling the statute of limitations. We disagree, but since some of the language in Peterson is susceptible of such an interpretation, we find it necessary to offer a clarification.
In Peterson the plaintiff filed her praecipe against three defendants ten days before the time permitted by the statute would have expired, but she instructed the sheriff to hold the writ directed toward one of the three, Valley. Consequently Valley was never served pursuant to process issued by the plaintiff, but it was subsequently brought into the case by one of the other defendants. Three and a half years after the filing of the original praecipe, Valley petitioned the trial court to remove it from the case as an original defendant, and the court granted the petition.
On appeal a majority of this Court agreed with the trial court that the original summons was a “nullity,” as it plainly was, since, because of the plaintiff’s instructions to the sheriff, the writ expired without service being effectuated. But neither this Court nor the court below held that the praecipe or the commencement of the action with respect to Valley was a nullity, although, in support of its holding that the summons was a nullity, the opinion of the majority cited and quoted with approval from two Mercer County cases—Bittler v. Rocco Bono Equipment Rentals, 38 Pa.D. & C.2d 458 (1966) *476and McCrystal v. Berczel, 8 Mercer L.J. 75 (1965)— which did conclude that a hold order to the prothonotary nullified the commencement of the action. That this Court did not hold in Peterson that the plaintiff’s instructions to the sheriff nullified the commencement of the action is made clear by subsequent language in the opinion:
“In Salay v. Braun [supra], we recognized . that the right in a plaintiff to keep an action alive until service can be made on a defendant was not absolute for any particular period of time: It ‘has always been protected from abuse by the doctrine of non-pros for unreasonable delay in prosecution’.
“Plaintiff here could have caused the reissuance of the writ at any time until September 9, 1966, two years from the filing of the original praecipe, but chose not to do so. Having caused the original writ to be held and not served, and having failed to reissue it within the time allowed by our decisions, there was no right in the plaintiff to keep Valley on the record as a named defendant.” [Emphasis supplied.]
435 Pa. at 241-42, 255 A.2d at 582.
Thus, the plaintiff in Peterson, was barred by the statute of limitations not because she failed to commence her action against Valley within the requisite two-year period, but because she failed to have her unserved writ reissued during the subsequent period permitted by law.5
*477Our decision in Peterson was filed on June 27, 1969. Appellant in the instant case filed her praecipe with “issue and hold” instructions on August 28, 1969. For the reason stated above, We believe appellant and her attorney were entitled to rely on Peterson for the proposition that the mere filing of the praecipe in trespass, even if the plaintiff deliberately delayed service, was sufficient to toll the running of the statute of limitations for an additional two-year period. Since she subsequently effectuated service well within this additional period, she is consequently not barred by the statute of limitations from pursuing her action. This, however, does Pot preclude relief to appellees under the non-pros doctrine if the trial court should find, after an appropriate hearing, that appellant unreasonably delayed the prosecution of her action and that appellees were prejudiced thereby. See James Brothers Co. v. Union Banking and Trust Co. of DuBois, 432 Pa. 129, 247 A.2d 587 (1968); Gallagher v. Jewish Hospital Ass’n of Philadelphia, 425 Pa. 112, 228 A.2d 732 (1967).
Nevertheless, we now conclude that there is too much potential for abuse in a rule which permits a plaintiff to keep an action alive without proper notice to a defendant merely by filing a praecipe for a writ of summons and then having the writ reissued in a timely fashion without attempting to effectuate service. In addition, we find that such a rule is inconsistent with the policy underlying statutes of limitation of avoiding stale claims,6 and with that underlying our court rules of making the processes of justice as speedy and efficient as possible.7 Ac*478cordingly, we believe that the rule must now be qualified, but prospectively in fairness to plaintiffs who have relied on the language of Kule 1007 and our previous interpretations of it. Cf. Anderson v. Bernhard Realty Sales Co., Inc., 280 Pa.Super. 21, 329 A.2d 852 (1974) (concurring opinion, Spaeth, J.). Our purpose is to avoid the situation in which a plaintiff can bring an action, but, by not making a good-faith effort to notify a defendant, retain exclusive control over it for a period in excess of that permitted by the statute of limitations.
Accordingly, pursuant to our supervisory power over Pennsylvania courts, we rule that henceforth, i. e., in actions instituted subsequent to the date of this decision, a writ of summons shall remain effective to commence an action only if the plaintiff then refrains from a course of conduct which serves to stall in its tracks the legal machinery he has just set in motion.8 Since the manner in which writs of summons are to be prepared and delivered to the sheriff for service is not covered by our rules and since there are differences among the judicial districts of Pennsylvania in the procedures followed in these matters, a plaintiff should comply with local practice as to the delivery of the writ to the sheriff for service. If under local practice it is the prothonotary who both prepares the writ and delivers it to the sheriff, the plaintiff shall have done all that is required of him when he files the praecipe for the writ; the commencement of the action shall not be affected by the failure of the writ to reach the sheriff’s office where the plaintiff *479is not responsible for that failure. Otherwise, the plaintiff shall be responsible for prompt delivery of the writ to the sheriff for service. Cf. Pa.R.C.P. 1009.
The order of the Superior Court in this case is reversed, and the case is remanded to the Court of Common Pleas for further proceedings consistent with this opinion.
ROBERTS, J., filed a dissenting opinion in which POMEROY and NIX, JJ., join. POMEROY, J., filed a dissenting opinion in which ROBERTS and NIX, JJ., join.. See Act of June 24,1895, P.L. 236, § 2,12 P.S. § 34.
. Handwritten on the praecipe were the words “Issue & Hold.” There is no question that.the attorney was responsible for the writ not being served. In a responsive pleading to new matter subsequently raised by additional defendants in the case, appellant admitted that her counsel gave the “issue and hold” instructions to the prothonotary; she further acknowledges this in the history of the case contained in her appellate brief.
. Oral argument on the preliminary objections was held on December 21, 1971. The record does not indicate why the court’s ruling was delayed for more than two additional years.
. It is clear that in stating that an action may be commenced by filing a praecipe with the prothonotary, the rule does not make the commencement conditional; rather it indicates that the filing of the praecipe is one of three alternative methods enumerated in the rule for commencing an action.
. The Court in Peterson summarized its holding as follows:
“In summary, Valley was properly removed from the record in this case as an original defendant because, first, it had never been served with process due to plaintiffs own instructions, and second, even if there was no deliberate failure to prosecute, the time for the reissuance of the writ, as established by the decisions of this court, had expired.” [Emphasis supplied.] 435 Pa. at 243, 255 A.2d at 503.
Again, the two reasons enumerated for the holding were presented as alternatives, and so, clearly, the plaintiff’s instructions to the sheriff did not in themselves bar her under the statute of limitations. Plainly, the language quoted about unreasonable delay in prosecution relates back, not to the avail*477ability of the statute-of-limitations defense, but to that of the non-pros remedy.
. See Schmucker v. Naugle, 426 Pa. 203, 231 A.2d 121 (1967); Ulakovic v. Metropolitan Life Insurance Co., 339 Pa. 571, 16 A.2d 41 (1940).
. See especially Pa.R.C.P. 126 (“The rules shall be liberally construed to secure the just, speedy and inexpensive determination of every action or proceeding to which they are applicable.”) and *478Pa.R.C.P. 1009(a) (Writs shall be served by the sheriff within thirty days of filing or issuance.). See also Rule of Judicial Administration 1901.
. If any plaintiff who, having filed a praecipe to institute an action, is presently engaged in such a course of conduct and thereby preventing or delaying service of notice of suit upon a defendant, and he subsequently fails to remove within ninety days of the date of this decision whatever bar to service he may have erected, he shall be deemed to have nullified the commencement of his action.