I obtained two modified Crimson Trace grips from a forum member here who is known to cut and modify many of his guns. The above grip on my S&W 310 is smaller than I would like but works fine.
The modified CT grip that I have on my Governor had the entire bottom of the grip's lower finger groove rounded off. White material was showing and I did not like the feel of the grip. I added some JB Weld to the grip and restored the bottom finger groove to near factory size and look.

Mark