Chuck jaw truing tool

[C-Bag]

Thanks olderdan for posting this. I'm not a trained machinist so there's no disapproval here. But my impression of being a machinist is not only a constant creative application of what you have to do the job at hand, but also to make the tooling to repair and improve your equipment.

So this is to me a novel way to true the jaws. I saw Mr. Pete take a ring and put it on the outside of the jaws and open them to tighten then grind them. As a FNG/noob can you give details how to make your rings because they obviously need to be done accurately. Or is that going to be in your plans for sale?