Have you considered a windshield wiper motor from a junk car?
I see that my last post was incomplete.
A windshield wiper motor is 12vdc and reversible. The wiping action is accomplished with a lever on a pivot with the motor rotating slowly in one direction. The motor speeds are easily controlled, on the older wiper motors with a robust resistor, and they usually have a mondo radial bearing, keeping the geared drive shaft securely located and capable of absorbing varying axial forces. Coupled with an inexpensive vertical thrust bearing, (a Lazy Susan style from any hardware store) and a cup of ingenuity,it might work. Or, you will certainly hate me for this dirt road, and ask that I be catapulted from this forum.
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