You can re-harden these mandrels by getting them hot and cooling rapidly by dipping in cold water. I very rarely have to do this but it does work if you need it. The only sizes I've had problems with are 1/32 and 1/29 inch. The 3/32 have lasted a couple of year without issue.
Robert
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Robert Simmons
(Former) Director for Bead Donations
Beads of Courage, Inc.
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