[Cyberphil]

Very interesting. Is the sprocket held in by those three screws I see acting like a clamping mechanism on the two opposite ends of the sprocket? If so, are you planning on anything if the sprocket does slip? At this point, that seems like the weak point in this design. But that could be solved by some ridges that fit into each other nicely.

Also, if you were to create this, would you use a keyed shaft, or hex? I only ask because in this render it looks like a keyed shaft.