Bracelet expanding mandrel - GIF

[Jon]

Bracelet expanding mandrel.




Previously:

Making a traditional Chinese jewelry box - video
Making bone jewelry - GIF

[Toolmaker51]

Bracelet expanding mandrel.

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Also works as a tail pipe expander.
Pick the right diameter and increase, a terrific stop in a lathe spindle. They can be purchased reasonably, and have decent range to work in many instances. You'll need a long T-bar and socket to operate; anybody on this site knows how that's done.