Great, now do you happen to know how to get one of them darn sega vector spinners off the panel? I couldn't seem to get the knob off mine.
Mine never came with a knob, so here's a picture of the shaft:

I'm guessing that there might be a hollow pin that goes through the spinner knob and through the hole in the shaft, similar to the one seen in the following picture from the 720 joystick manual:

If your spinner has been used, there's a good chance that the hollow tube is full of sweat/dirt/grease so youll probably need to give it a good scouring to find where the the hollow pin is.
Note: I'm guessing about the hollow pin, I could totally be wrong, although there is one such hollow pin elsewhere on the Sega spinner.