I have a brand new Happ Trackball, mounting plate and Opti-PAC for sale.
I was going to build a trackball only bartop, but have since scratched the idea.
I did wire the trackball to the optipac already for it to work via USB in mame, and it all tests out fine.
I am looking to get $80 for everything. Most of you know what each of these parts cost, and if you think the price is too high, please let me know where I could have gotten them cheaper
