I'm hoping that it won't be too difficult to disassemble.? Trying to stay away from any kind of abrasive or steel wool on old machines.? My usual go-to for varnish removing is to drop the parts in an ultrasonic cleaner filled with lacquer thinner. (Hope it works on whale oil varnish!)? If there's rust I'll follow that up with an evaporust bath, also in the ultrasonic.? I've just learned how to do nickel plating and might try it on some of these parts.?