Hello, after running 400+ rounds thru my PM40, my thumb knuckle where it butts up on the left upper part of the frame is worn raw. The corner seems to be a bit sharp (IMO) and the recoil and my hand position is causing a hole to be worn in my thumb knuckle joint. "shoot till you bleed, and then shoot some more"! I was thinking of smoothing the frame there with my trusty Dremel, but do not know the downside to this. I feel I need to have my hand as high up as possible due to the small size of available grip. Ideas/thoughts on this? I still am not shooting very well with this .40, I took other pistols (9mm) to the range this time, and they shoot great! More training is needed. I shot better, but not as accurate as more familiar pieces. No FTF/FTE's- I may have someone load snap caps randomly in some mags for me next time.Thanks!