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I am still quietly dreaming on for my own build. One thing that occurred to me if the roof was either automated or just electrically driven (With a little more design work it could work for a handle to twirl as well)
A rack and pinion is one thing however better again if one could be found would be a rack and worm gear. Reason being the worm gear (powered either by an electric motor or handle) will drive the rack however the rack can not drive the worm gear, so once moved to a position the wind will not be able to move the roof.
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