Originally Posted by Mrs. SewNSew

Joe, do you have a photo of what I would be looking for? If I knew what to look for, I could at least keep an eye out.

I'm looking closer and I can see the when the bottom wooden part is lifted to expose the treadle paddle and is clipped in the upright position it actually presses a small button on the right inside bit I thought was a terminal. That must be a switch perhaps to switch off from electric power?