So a few months ago, I too started having problems with extraction and ejection of my spent brass with my Keltec PF9. So about a month ago I decided to call Keltec CS and they send me another extractor spring and screw. I performed the procedure with some screws that I purchased from Home Depot and sanded it down to the correct size and used some blue locktite that I purchased from Wally World. Well after about 150 problem free rounds through my PF9 I will say it is successful and also this mod / fix; flings the brass much farther and stronger !!! I just wanted to share my experience. God Bless 