I have read about the commutators sections of the Lionel prewar armatures commutators letting go (blowing up) and destroying the armature. I tried to look in th forums search but could not locate on being proactive and to epoxy the commutator. What type of epoxy to use (JB weld any good?). Where to glue? Where to run a epoxy bead? Does this only happen on the Lionel prewar standard gauge or could this happen on the Lionel O gauge?