I have a RIA 1911A1-MS which has been a fantastic pistol...dead nuts reliable and accurate. However, I've always wanted to tighten up the thumb safety. What's the best way to make it "snappier"...as in more positive in CLICKING on/off? The only other 1911 I have is a Kimber and that safety snaps on and off like a light switch. Very positive. The RIA is just plain mushy. What parts would need replacing besides the thumb safety? I'm guessing the safety plunger and a stronger spring would be in order, too. Would a new thumb safety need to be fitted by a gunsmith? Thanks in advance!