Chuck jaw truing tool

[milomilo]

Thanks Chris
I would have installed set screws as you have done but the register on my old chuck is only 1/8 deep.
I used to operate a Myford cyl grinder with a griptrue chuck which had three tapered screws to bear on the register, I always wished it had four so it could be adjusted as you would a 4 jaw chuck.

I used only three set screws, as I find it easier to set the chuck, instead of four screws. Probably some sort of mental thing with me.