This is an expander mandrel. Good surface hardness, unaffected when used with annealed 4140 steel. Holds well and squarely in machined holes. got a job for me The best advice is to move between centers with the dog. There isn't much open ending to cling to. Between centers with little threading, I got <0.001 TIR on the part I machined with it. Good enough for my needs.
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