Glad that worked out for you Matt.
![:beer:](https://madmodder.net/Smileys/default/anim_32.gif)
Since this is a How To and others may be learning, I just wanted to point out a few additional things I think about when I do this operation.
I want to take as absolutely little off of the jaws as I can, because it increases the minimum diameter you can grip with the chuck. I'm mainly interested in removing a
small amount of run out by this operation, Nothing more.
It can't correct for an unevenly worn scroll, except for workpieces of the same diameter that the jaws were ground at. Different diameters will again show run out on a worn chuck.
I've had good luck using centrifugal force to keep the jaws out against the scroll, rather than gripping a set of spacers or rings. I just run the chuck at a reasonable speed and it seems to work, for me. Jaws have mass and they do want to move outward on the chuck
My process: I take VERY little meat off at a time, I just feed the stone outward a tiny amount until I just see a few sparks -- not a shower. I make passes completely through the jaw bore and I wait until all sparks stop, and then I stop the lathe and look at the jaws to see which ones are hitting. If all three hit over a reasonable length, I'm done. If not I'll take a tiny additional amount off. Generally the last pass my produce only an occasional spark, until they stop altogether.
I don't try to get a perfect clean face. This takes the minimum off needed to achieve the least run out possible with this method. Just personal preference -- and I don't have really rough chucks to deal with.