I recently picked up a nice single stage tall chute blower for my 520 and decided to put an electric chute motor and an actuator on it. After researching different threads here on the forum I decided to use a 4" actuator (ebay) and an electric seat motor (Amazon). I cut the seat motor shaft then turned it down on the lathe to fit a coupler that i picked up from McMaster Carr, then ground a flat spot on the shaft for the set screw. I also made a new shaft for the worm gear so I could keep the original shaft in case I need to use the hand crank again and I added a shaft support to the mounting bracket. I made a bracket for the switch box and used a couple of momentary rocker switches to control the motors and used a couple of Weather Pac connectors in the wiring harness so I can unplug the wires under the hood when I take the blower off. Right now I'm not going to put any limit switches on the rotation motor, I'll add them later if I need them. I still have a few things to finish up, I'm going to cut a piece of inner tube and zip tie it over the chute motor to help weatherproof it and I need to insulate some wiring from the muffler heat etc but overall I'm happy with the way it turned out..... And my wife finally got tired of listening to me complain that I needed a welder and bought me one for my birthday.