I just replaced my scroll wheel in my mouse, a one minute repair. But now I've seen something that can't be unseen.
Logitech scroll wheels apparently function using magic.
It freely rests on three buttons that detect left, right, and straight down presses. But the wheel itself is not electrically connected to anything whatsoever. It's plastic resting on a spring.
How does the mouse know when I'm scrolling? And why was it affected by dust and gunk?
Edit: and how does it detect which direction you are scrolling?