Well, it's an undersize sear pin hole, by about .005". Not sure how hard the frame is? Not trying to be to cheap, not aware of any good smiths I would let do the job in my area, and I could always send off to a reputable smith. This is not an expensive pistol by any means, just not worth dumping a lot into it. The trigger pull was about 9#, had another trigger and sear of decent quality, so I installed them. Well, I have the trigger pull down to 3.5#, and when I let rack the slide quickly, the hammer will drop to the 1/4 stop. There is a sharp edge on the hammer hooks, and sear is honed correctly(I would say). I just feel that the small amount of play from the sear pin dia., to correct sear hole dia., it lets the sear release from the hammer hooks?????