Search on 'bushing', 'sleeve bearing', or 'standoff'

I looked through McMaster, found SAE 841 bronze sleeve bearings for $.62
each part number 6391k178. They have the same thing in steel, just not
quite the right wall thickness.

Wow!!!! The main reason I was trying to make some is for some kits I want to
sell. And the main motivation factor in that is that the original supplier
of a robot drive unit that I bought the wheel+shaft from ( that you see in
the photo ) charges $9.00 for that little piece of metal!!! I over tightened
the screw in one of these and tore the threads right off the screw but left
it inside the shaft, so I had to drill and tap a new one.

Thanks for your help. This is *very* good advice and information!

Thanks again !