Van Dorn Repulsion Electric Motor

[Lewill2]

Ok, I'm way out of my knowledge base on this one. A friend is looking for help on restoring a Van Dorn Repulsion Motor. It is an old electric motor for a bench grinder. As he describes it the centrifugal start/short mechanism. Not sure if he meant start/stop or not. He is looking for this part or a copper disc that is part of the mechanism. The pictures show the mechanism and the broken disc. If anybody has any information I would appreciate it.