I have a 4J chuck challenge set-up. No gimmick or traps (like at the Bar-z bash). Just a piece of stock 316 SS with a machined “ring” on the end (so that part is actually round), a cheap mag base with an off shore dial indicator and the 4J on the little SM1120. Everyone who wants to try it can. We’ll get someone to run a stop watch. The jaws will be set to the same starting position for each of the contestants. Just get it to run less than a thou and your time stops. We won’t go measure it with 1/10 indicator and add any deviation to your time (maybe next time?). Only the ring needs to run true, not the face.
Oh, and bring some cool / unique tool or project you are working on for the group to drool over (if you want).
Sure, good idea Tom: if you have something you’d like to sell or swap - go for it.