I've just acquired a used Kimber 1911 Tactical Pro II. It has obvious carry wear and the customary Idiot Scratch. While cleaning it, I noticed one of the grips was loose. On trying to tighten it, I discovered the threaded stud is turning freely in the frame One does the same for the grip on the other side as well. 1. Has anyone else had this problem? 2. Is Kimber pretty good about taking care of this kind of problem?