The old switch fell back into the box. It was being held in place by a metal clip on the frame, shown here on the wood feed-board of the press. I could not get it to grab the switch, so I figured I would just replace it with a household switch, but am unclear about the wiring. There are no markings at all on the original switch, other than ON/OFF on the switch toggle itself. In the photo showing the back of the switch, one pole has two wires, while the other has one. The toggle points to the OFF position when it is pointing toward the end with one wire.
I trust that you tried to squeeze the sides of the bracket against the switch. You could solder or glue the metal parts together. See the attached image of a No. 4 switch that shows the specs.