Closeup of the flywheel and sticker of the other drive, saying "MPI Model 101SM" manufacturing date October 1983

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   root42 (root42@chaos.social)'s status on Sunday, 26-May-2024 01:50:57 JST root42

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   Interesting! The two mechanisms are slightly different! Drive unit 1 is a 101S and drive unit 0 is a 101SM. I wonder what the differences are, except for the slightly different motor.
   To me the motors look exactly like the tacho motors used on the Micropolis mechanisms. I do have one or two spares should the need arise...