Some images to followup Colin's post yesterday evening, and even a gif this week!

Firstly, the lathe - Colin has spent a lot of time at the wheel of this over the past week, turning the poles for the new gearing stuff. Here one of the poles can be seen, after been turned somewhat already.
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Secondly, the completed reduction sprockets on their central mount.
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Thirdly, a quick gif which demonstrates the level of reduction from chain movements.