I used an old, burnt out, servo, from a 2 channel radio.
I removed the PC board & I modified the gearbox to do 360 Degs rotation & made a small Al. pulley.
A simple "O" ring for the drive belt & a small, 2 x AA powered, Up/Centre off/Down switch & a pot for speed control through a simple voltage/current regulator.
I also included an on/off switch to conserve the batteries.
All up cost of about $10.00.
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