Algodoo

I've seen this type of mechanism many years ago but I can't remember where and how it was used. I vaguely recall that it was used to prevent a shaft from rotating backward.

By the way, I noticed if I pulsed the right arrow key (approx 1 per second) the circle creeps a few degrees beyond its locked-up point with each pulse. If I zoom way in, and hold the right arrow key down, I can see the circle continuously creep in a clockwise direction. Maybe nothing you need to bother fixing.

Q: The circle continuously creeps in a clockwise direction.
A: That's an Algodoo thing. In real life they don't slip once set.

Yes, I know that. That's why I didn't think you would even bother with it. Cool scene, though.