I have a question for anyone who has taken apart a bachmann Spectrum series HO scale 2-8-0. are there supposed to be small bushings on the worm gear's shaft? I dissasembled my loco, then reassembled it, but the worm shaft is sloppy and the loco binds up now. I was just wondering if there were a couple small bushings that might have taken a trip across the room when I took the loco apart. It did kinda get out of control the first time, so I wouldn't doubt it, but I just wanted to make sure. I noticed that there are molded cavities in one half of the engine's weight/frame which could very easily accept two small "heel" shaped bushings and that's where the slop is located. The exploded parts view shows the shaft and what appears to be two small bushings, but it looks like I'd have to buy the whole motor assembly. If there are supposed to be two bushings, does anybody sell replacements?