Thankx Amiga Kit.
I have a Micromys but it hates my Atari 8-bit, hates my C64, and will only use the Scroll Wheel mode on my 1200, but not my 600, though my 600 just died last night so it no longer matters anyhow.

Anyhow I found a mouse that kind of works with this USB adaptor, though Freewheel does not seem to realize there is a wheel there.
I'm going to write the seller, so if he can resolve these issues, then will post back here.