Mercury arc rectifier

[ppppenguin]

I think I've got one of those cutters. The panel is steel so an occasional touch from the router probably won't harm it. Good idea to add a spacer, I've got various thin sections of wood including a load of slats from an old venetian blind which are good for making shims. Almost impossible to run the roller on a 1mm or so thick panel that's in contact with the plastic.