Just need one single harness for a spinner.
I'm trying to hack a Betson/Imperial trackball from using the internal mouse interface to using the Oscar mouse interface that I got with my spinner. I don't want to pay $14.50 for the Happ interface cable shipped, since I really only need three tiny cables plus the connector.

I'm hoping someone has upgraded from the mouse interface to an Optipac and can help me out.
Thanks!
Coleman