Okapi,
Thank you for the advice and insight. The addition of a shim (piece of feeler gauge) sandwiched in between one of the chuck jaws does bring the part into better concentrically when using a 3-jaw chuck. I sometime use the thin metal strips from the store RFID tags for these shims (see http://www.homemadetools.net/forum/t...fid-tags-19067) when I don't want to remove the 3-jaw and mount the 4-jaw for this level of precision work.
Thanks, Paul Jones

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