I get the circuit I was referring this to the OP. I don't understand the reason of using two switches to turn the motor on and off when one will work fine. Like on the Hornadys LNL Case Feeder. One switch in the normally closed position in the top of the tube, tube fills, forces switch arm open, motor shuts off, easy. Half as many parts and wiring. My question is why 2 switches? What is the advantage?