Doug, if your machinist has enough bed length,

by John K., Monday, April 29, 2013, 20:56 (4229 days ago) @ Slow Hand

an option would be a custom mandrel turned down to a tight fit in the receiver and then the chamber at the very end with a transverse small bolt or set screw as a drive dog. Steady rest and tailstock center, then thread. Not ideal, but still centers everything on the bore as needed.


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