I have a CZ 85 Combat that has a nice extended checkered magazine release button. My CZ 75 Kadet pistol has a smoother, beveled and shorter release button. I called CZ and they said all release buttons on those models are interchangeable, so I ordered a CZ 85 Combat magazine release for my Kadet. So far, I have broken 2 screwdrivers, and my gunsmith blocked it up on this drill press table and put a bit in the press and turned the quill by hand, and broke his bit too. He said that is the first screw he has been unable to turn and he is an old man. That screw is too small to be in that tight. Any suggestions? Think they used Locktite? I suppose I could use some heat. Anyway I want to know if anyone has changed the magazine release on one of these pistols. Thanks.