Hi,
I read this with great intrest! I don't quite get the retention idea, but it sounds very sound. Can you send me a photo so I can see what you mean by placing the screw below the trigger guard? I am sure I will see right off that I know what you are talking about. I don't know for sure what a saddle wassher and a T nut is. I'm sorry I just started to make holsters and have been using the thumb break retention system; however your design sounds much more effecient.
Thanks,
ernie