I have seen a couple of chute rotators made from electric window motors. Check this website and YouTube.
That is really useful! Thank you very much!case13 - Here is a link to the motor I used on my M84 Snowcaster for chute rotation: https://www.sciplus.com/car-seat-12vdc-gear-motor-49248-p
I've included a pdf file of a chart I made up to help me decide what rpm motor I wanted:
Here are pics of the caster with the seat motor installed using a bracket I made to support it: