You could get some of these gears in assorted sizes, a larger central gear mounted on your block with several small ones meshed to it to mount alligator clips to hold hooks......
10PCS 11164 Metal Spur Diff Main Gear &Motor Pinion Cogs For HSP 1/10 RC Car | eBay
Then use one of these to drive the central gear.....
Gear Box DC 12V Reversible High Torque Turbo Worm Reduction Electric Motor 10RPM | eBay
This is just an example, I don't know what final rpm you would want, but you could tune that in with different gear sizes and you can get those reduction motors at almost any RPM.


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