Replacing it is the only permanent fix. The armature hole has worn too large. If you take tweezers to the armature shaft and can wiggle it at all, even a tiny amount, it needs replacing, the lube will just spin off or run down to the commutator face. I suppose if someone wanted to make a bushing to fit the worn out brushplate it can be done, but hardly worth the trouble. Lionel tried in the late seventies adding a bushing to the 2035 style beushplate, but they never repeated it.
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