Wow does this take me back to early slot car racing.. Any epoxy will work the thicker the consistence the better. I did the whole armature covering all the wires (not the metal) right down to the commutator and even it a little. Let it dry really good, try to rotate armature while epoxy is still loose so you don't get a big glop somewhere. Once dry but it in a drill motor or a drill press if you don't have a lathe, turn on the drill and carefully file down the epoxy. While your at it now would be a good time to balance the armature. You can really increase the voltage to the motor once you do this.
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