The transmission design of a belt primary with the commonly available max torque 10 tooth chain clutch on the jackshaft is the best on the market and makes for the thinnest motor setup just like a whizzer.
I recently put one of these on my EZ bike and it is the best transmission to seat post mount I’ve ever had and very easy to install. View attachment 94285
I did electrical for more than 30 years. That isn't a grounding clamp. That is a 3/4 one hole rigid conduit strap. Grounding clamps are made of copper or aluminum.