Time to clean and oil (and this time not have to repair) a National Cash Register 11-EN electro-mechanical adding machine from the early 1950s.
Done! One reason I cleaned it is I smelled that "old appliance" smell and wanted to ensure the motor wasn't strained. I ran it with the cover off and saw flashes in the back. The mechanism disconnects the motor when it's not needed, and that makes it arc. I was smelling ozone!
