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by CrLf 814 days ago
I built one of those many years ago as well. :)

  * https://github.com/carlosefr/DisKnobUI
  * https://www.youtube.com/watch?v=MvpPVjJnbao
It thought about using that (the spindle motor from a hard-disk) for this project. The issue is that it's not very precise at very low speeds. It sort of works, but it falls out of sequence too often.