Trackball hook up to sega i/o NAOMI

Looking for a very small trackball compatible with the sega I/O. Any help with this and how the heck do you wire it into an existing naomi setup?

It is a special trackball I/O card that you connect to the first I/O board that your after I think. Don't think I'll sell mine. ^^;

You could do what I did and find a cheap Dynamic Golf kit with panel.

What you need is the trackball assembly (or cage if you will), the cables, the input-board with sega-specific parts to use it with the Naomi.

Just the input board would be enough if you've got some DIY skills, connect any tracbball or maybe even a mouse to it that way

Any way to hook up a trackball without using the sega one? I'd like to get a really small one for my cab. I've seen 'em about the size of a 50 cent piece.