Barrel communtators were not used on Lionel O gauge (except later can motors) just super motors and early build-a-loco motors. The phenolic ring is highlighted above. There is a small step in the communtator that the ring fits snugly over to retain the segments. If the ring cracks or is missing, the segments will fly apart like the weights on a governor, tearing off the leads to the armature. I don't think glue or JB weld will be strong enough to resist the centrifugal force.
Great information, so it looks like the best thing to do is to use a slow cure epoxy which is stronger and to place the epoxy between the ring and windings/coils and to build it up as necessary. The next question is cleaning this ares. Could a spray type electronic cleaner (that does not effect plastic) can be used? Not sure if alcohol can be used as one does not want to remove the covering on the windings.
