Folks,
I have been a bit disappointed that there is no Crimson Trace Laser Grip (LG-661) available for the M&P with thumb safeties. However, I found a thread where the owner cut the right side thumb safety lever off, and was able to fit the crimson trace grips on with no problems. Since I am right handed, I don't need ambi anyway. But I like the thumb safety.
So before I would contemplate doing this, I wanted to get a new thumb safety so I can put it back to original if I wanted to. Is there are source out there for them?