Screw/screw gearing viewed from the side - you can see the teeth meshing together in the middle.
Full video at https://youtu.be/0ZPo3HxR0KI
@henryseg
Chris Ramsey would spend hours playing with that gear mechanism
https://youtu.be/QPadsXLv2iE
Okay, wait, do you just lay in bed working these things out instead of going to sleep?
@henryseg that is horrific. Like babies’ teeth!