This is a common problem with gear boxes in which the bottom cap traps the the axle bushings the screws loosen just enough to allow the bearings to rotate and it causes the bearing seat to wallow out. I would replace the gearbox left and right clamshell with what ever else you need. When you reassemble use some loctite or paint the head of the screws and don't over tighten. When I rebuild / CLA gearboxes I also put some loctite on the bearing seats a little extra assurance the bearings don't rotate in their seats. I wish they used square bushings on the gearbox axle shaft. I have a couple of old Williams and Weaver brass locos which have this problem of the bushing seats being wallowed out. When these axle bushings wear it also changes the mesh between the gear on the axle and the idle gear of the box. If these bushings were square and made in an upper and lower half ( or front / rear) it would be easy to replace them. As it is you have to pull the drive wheels off and re-quarter them on assembly. j
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