So how does a mouse work anyway?

Meet the world's worse mouse design ever. The Atari ST mouse. Amiga owners liked their tank mice, we ST owners didn't like ours. It was square, uncomfortable and prone to breaking quite easily.

Mine is broken, I try to fix it. I fail. But along the way I get to figure out how it works, which was worth the effort. ... https://www.youtube.com/watch?v=_-muqApQG_U