In article , Jon Elson says...

Clean the inside of the backing plate with solvent, and then mark
it with dy-kem, Hi-Spot blue, or even magic marker. Screw the chuck
on and back off, and the place where the dye is removed will show
where it is binding.

I keep one of the "extra-huge" blue sharpie pens in the workshop.
Almost as good as dye-chem and they don't spill.

He probably has the register diameter a bit short, or a bit small,
on the backplate.

Jim


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