Can a industrial sewing machine motors lever type be exchanged for some kind of potentiometer? The regulator or switch that is there now seems to be some kind of magnet switch or lever where there is a magnet on a lever that moves over a sensor to regulate or turn on the motor. I could use the lever that came with the kit but it ruins my whole lathe design that im building, dont know where to put it cause its really big, and a potentimeter would take up so much less space. All help is greatly appreciated.