Escalator internal mechanisms.
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Previously:
https://www.homemadetools.net/forum/...777#post163647
https://www.homemadetools.net/forum/...737#post163429
https://www.homemadetools.net/forum/...676#post132966
https://www.homemadetools.net/forum/...260#post116135
https://www.homemadetools.net/forum/...122#post180266