[LancerSykera]

The teeth of the wheel are holding on to it, and it looks like there are always two teeth inside the top.

[dwaltrip]

Oh I see what you mean. The teeth slide through the curved channel, and are notched such that the channel is held in place. That is a clever design.

[jarin]

It's clever as long as you operate in a zero-friction environment :)

[lambda]

I'm wondering if the effects of friction could be mitigated by having ball bearings within the channel that the teeth pass through.

[sanoli]

That's what I thought also. Wouldn't the amount of force pulling on the cable lead to some jamming as soon as the little spokes stopped spinning so freely?