Loren wrote:
If you were in my shoes.. what would you do?
A shaft is needed for a machine, 1.5" dia, but with a collar at the
middle of it. ...
Thanks for the advice
- Loren

I'd look real hard at a separate collar clamped or pinned to the shaft.
If you use a taper pin it can be retightened if it works loose.

Most of the shafts on my South Bend lathe are assembled with taper
pins.

jw