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I am not sure if this will help or not....
but this Interamrs PPK is not factory and you might want to contact the seller to get info on who did the work to extend the frame

http://gunbroker.com/Auction/ViewItem.asp?Item=74915198

*edit
also Cylinder & Slide has done some nice work on PPK's
http://www.cylinder-slide.com/index.htm

 

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Oh I forgot to mention somebody else....though I am not sure if he will work on Interarms made guns but it may not hurt to ask him

Earl's repairservice
http://www.carlwalther.com/page2.htm