Hey, I just happened to have a Discs of Tron spinner in my lap, with a bunch of mouse parts, with a big question mark on top of my head when I read this message.
I spent the day trying to get the spinner to work.
It's really easy! I had a busted MS mouse. I removed the original DOTRON optic card that was in the control panel, and placed the mouse guts so that the sensor/emitter wraps around the spinner's outer ring (in the same way that the original card wrapped around it). It works perfectly!
Here's the link that someone recommended to me that showed me how to do it:
http://home.socal.rr.com/gsimpson/As for the up/down motion, that just acts like regular old buttons. I haven't gotten around to that just yet, but it'll be easy.