That's a good idea, I'll do that. The flat spot on the shaft allowed the set screw to move ever so much, but when it rolled to the edge of the flat I think it put an outward (oblong) pressure on the sprocket causing it to break. And after looking into the over volt on the motors wouldn't be that harmful to them, they are a pretty robust and slow motor to start. Agree with the cost , as I'm use to spending $300-600 on motors like lmk or neu and I push them to and beyond limits but still try very hard to limit the magic smoke when they disagree with what I put them through. Cooking some of them almost makes me cry
. As long as the new larger sprockets don't hit anything I'm just going that route. I should have them tomorrow. A small hole and some red loctite should keep um planted.