The stepper motor (taken from an old printer) and the propeller gear.
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The rails, to read the time, you look at the lower track and read off the hour, then you add the minutes shown on the top two tracks.
The drive circuit.
The trails, and 28 mm diameter balls (1 1/8 ").
The workshop and us.
The ball lifter, 2 wooden gears which raise the balls from the bottom to the top