The Cub's minimum PTO speed is roughly the same as the rated PTO speed for most older tractors (i.e. 540 RPM). You'll be trying to drive the tractor's engine at maximum RPM using the Cub's absolute lowest possible power output.
It would be relatively simple to make a chain drive reduction of perhaps 3:1 or more to slow down the Cub, multiply the torque the engine is producing, and potentially give it the leverage it needs to turn the tractor's engine over at a much lower RPM.
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