Interesting concept. How did you make the ring, and what material is it?
I'm pretty sure that only works for the diameter you machine it to.... If the chuck varies as you move the scroll, you will no longer be centered....Bob
Figured it was a shortcut to bypass grinding the jaws, so completely glossed over it Otherwise; looks like a great way to do it-have full access to the length of the jaw, unlike using a plain ring of some kind.Jesse