[Biff]

It's new this year. Plastic shaft 0.645" dia with six "square" teeth 0.156 wide and (0.780 - .645)/2 tall The toothed part is about .7" and the shaft center which I assume doesn't rotate comes out to 1" from the plate. Three mounting holes 2.329 approx on the small leg of the triangle and 4.047 approx on the long leg shaft center is 2" from the top of the long leg and 2.22 from each of the ends of the smaller leg. The 5/8" window motor shaft mount fits right on the new drive and the whole assembly is lighter. I haven't checked free speed or the new mass yet. BTW check all first inventor parts that you plan to take to get mill work done on as I didn't last year with it's new window motor, I had to do a lot of hand work to get the proper fit on the coupling we had machined. Wiring it is going to be fun also as it looks to be a water proof mating item. With the pins deep in a plastic receptacle.