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.