Bob Engelhardt writes:

John E. wrote:
Couldn't you mount it in a 4 jaw chuck and turn it in a lathe?
Dan

Hmm... that's one solution. Thanks.

Others?

To me, using the lathe is so straightforward, fast & easy that it
isn't even worth considering other solutions.

Unless, of course, step 1 for the OP would be "buy lathe", and he's
already mentioned he's got a milling machine.