Quote Originally Posted by Dennis View Post
I don't quite follow that Mark. If it's sanding drums you are referring to, then the cavity in mine is more like 3+ mm in diameter and require a tapered screw mandrel.
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These are the polishing drums I wanted the mandrels for, Dennis:
http://www.cooksongold.com/Jewellery...prcode-970-426
The basic design for the type of mandrels I needed can be see at the bottom of the picture, though the ones I showed in the first link in my opening post have a longer threaded section on them and are better for the job really.
Mark.