The twist tabs in the reverse units are pretty much indestructible. Might want to be careful with the tender tabs as they are just a thin tin like materiel. Make sure everything cycles and runs good before reattaching the tender shell to avoid multiple twistings. Original gilbert track will easily fit in a 48' dimension. Make sure that the armature has a slight bit of play front to rear. Oil the front of the armature shaft where it enters the chassis bearing (do this from the top of the chassis) and a drop on the brush holder end. Earlier brush holders usually have a small piece of wicking material in the brush holder where the bearing/armature shaft connect. Also a few drops on the pin that holds the gear that is connected to the smoke piston. Make sure all old hardened grease is removed from the axle gear and armature spiral gear. A few dabs of white grease on all gears. Make sure there is a little spring pressure in the reverse fingers on the drum. Not too much or there will be excessive wear on the fingers and drum. Really easy once you get the hang of it.
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