I am searching for a 13/32 Forstner style drill bit to insert S&W medallions. This size was recommended by Ajax Grips. I have an old set of Sambar Stag grips that I'm trying to drill. I have checked all the hardware stores in my area and have done an internet search, none of my efforts have not been successful.It seems that this size drill bit is impossible to find . I wonder if 7/16 would be too loose a fit? Any suggestions? Thank you.