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My original post asked about fixing the drive gear that was slipping on the axel spline. I used a gap filling cyanoacrylate to epoxy the gear on the axel. It held and did not move on the axel, laterally or rotationally under pressure. The true test would have been running it, which was not to be. Everything went from bad to worse. All but one of the plastic spacers on the axels (on both trucks) between the wheels and the ball bearings crumbled. The tabs on the top cover plate of one the trucks that the screws use to hold the top plate on disintegrated. One of the top cover plates broke in half and the aligning post, that is part of the top plate, broke off (this might have been my fault). The advice I got on the first post was right. Replace the trucks. Still, it was fun to tinker with the truck assemblies.
 

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I would replace the trucks . I have a first generation shay and it all fell apart. I bought a new set of trucks which are all metal now . Adds weight and beter running
 
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