New to me Optimus 535A. This is my first alcohol boat stove. The boat registration number is pencil engraved on the tube. VA 090 40 0777. The VA indicates state of registration in the USA which is Virginia. Stove was purchased from a person in Maryland which borders Virginia. So much for geography lessons. Complete disassembly and cleaning was in order as the tank had old alcohol in it which had tainted the tank innards black. The burners had to be removed and cleaned and the brass gauze removed and cleaned along with the spindle seats and spindle taper reworked. They did not seal and allowed alcohol to leak through nipple after shutdown. New Viton pips for fuel cap and NRV with cap gasket. Note the older style Optimus fuel cap reminiscent of the embossed style 8R stoves. Leather pump washer was replaced as the old one was dry and brittle. Mineral oil applied to maintain it for a long time to come. This stove runs best on Galley heat alcohol as I believe the regular denatured alcohol has too much methanol as produced in the USA. Jasco green I am sure would be just as good as the Galley heat brand.