At any rate, given a set of chuck jaws in reasonably good condition, and
fitting in the chuck okay, an inch or two of the delrin in the jaws should
provide plenty of stability to machine. It's often interesting to indicate

Have you seen a sherline chuck? There is no way he can get an inch of
contact period. Holding anything over 3/4 inch means he is grabbing
only about 1/4 inch. Been there done that and bought a bigger machine.
chuck