"Bob S" wrote in message

If you can index and lock the spindle you could manually shave
gripping grooves in the OD of a ring with an appropriately ground
lathe bit in the tool holder. Don't expect to take more than a few
thousandths off per pass.
jsw


I suppose that another way to get grooves would be to take the part
off the lathe, mount it on some expendable wooden rotating and
sliding
fixture, and make grooves with a Dremel grinder.

Or if I can get the Unimat II going as a mill I could cut grooves as
though it was a gear-cutting exercise; that would probably be a lot
neater than trying to control a Dremel...

Bob

A triangular file would be neater and easier to control than a Dremel
if your hands are steady enough. Wrap a strip of paper around the ring
and mark where the end overlaps. Lay out lines evenly along it and
transfer them to the ring with a prick punch.

To lay out the strip marks you could place it on gridded graph paper
at an angle that gives a spacing you like, with the ends aligned on
the grid.

jsw