Speaking of
button hole trackballs (in that awful spinner thread), here's an idea to get the ball rolling (*badum bump*):
Find a plastic bottle cap that has a little round bump right in the middle (like a hemisphere, about 1/8th of an inch in diameter. Sorry to be so vague... I think I got the one I have from a water bottle). Otherwise just try whatever water bottle cap you can find...
Next, take a pinball ball (preferrably new). It should fit pretty well in the upside down bottle cap. hold the cap on your desk with one hand and now spin the ball with the other...
Feels pretty decent doesn't it?? Imagine it on low-friction rollers. The weight of a pinball is heavy enough that on rollers you'd get enough spin to enjoy most trackball games (other than perhaps Golden Tee).
So that's the proof of concept basically. (I'm not suggesting an actual trackball can be made from a bottle cap. That's just to demonstrate how it feels using a pin ball). If it can't be crammed into a button-hole form factor, it could probably at least be designed to be rather compact ( 2" x 2" footprint?) or fit in a button hole on metal control panels.
Have at it guys! I don't care about credit! Someone manufacture it!
