Ok, I think I understand. Now, is this a sensor type that requires something placed on the shaft? Not a big deal....just don't know much about this stuff. Seems like a simple enough plan.
A curious question I had....in my simple world, is this. Could the same idea be achieved using 3 switches? 1 being the power button, and two more SPDT lever style switches. My thought was if I hit the power button, and something is pressing on one of the SPDT switches, the motor will run until the other switch is pressed. Then it could rotate in the opposite direction until the other switch was pressed again. This is all assuming I can make some sort of small ball screw type carriage that sits on either the main shaft or a layshaft. May be a really dumb question, but I have to ask.