1930s hangar door mechanism.
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Previously:
https://www.homemadetools.net/forum/...039#post160648
https://www.homemadetools.net/forum/...040#post153319
https://www.homemadetools.net/forum/...628#post118100
https://www.homemadetools.net/forum/...178#post149795
https://www.homemadetools.net/forum/...543#post166688
