40mm Arcade Trackball Assembly

Ok, I'm not suggesting you go out and buy a Kensington Orbit, Adesso iMouse or Logitech Trackman Marble Mouse just to get a 40mm trackball to use with this system. That wouldn't make sense as you could put that money towards a X-Arcade or Ultimarc (or many other) arcade trackball setups for that. The idea is that you own one of these trackballs already or maybe that you can get hold of just the 40mm ball part for a cheap price, or alternatively use a ping pong/table tennis ball as it allows the optical glow from the mouse to shine through. The trade-off is that they don't have much weight to them With the aforementioned ball, six 5mm ball bearings, some rubber bands and a spare optical mouse (plus a 3D printer, obviously) you can put together a small footprint, control panel-mounted trackball to get shooting those Centipedes or Goldening those Tees(?!).Do make sure to test whatever 40mm ball you are going to utilise with your spare optical mouse first tho'. Not all opti