Frank,
Thanks for the info. I have previously purchased some thumb studs, but it seems that most are too big in diameter. I also am not a big fan of a countersunk hole in the back side of the blade.
I was at the Badger knife show this past March and was impressed, I saw alot of knives with custom made studs that appeared to be in the .125 dia. range with gem stones inserted in them, they had a clean look, not clumsy. Thanks, Dan