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Make the rings out of angle metal then you just need a drive and grease.
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Chevron-cut [3D printed] planetary gears act as a thrust bearing.
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Herringbone gear
A herringbone gear, a specific type of double helical gear, is a special type of gear that is a side to side combination of two helical gears of opposite hands. From the top, each helical groove of this gear looks like the letter V, and many together form a herringbone pattern.Wikipedia
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'Cold dead hands' isn't on everyone's mind, apparently.