@Harry Henning has posted this advice several times over the past few years. To run a ring of 2 part epoxy around the end of the commutator segments closest to the windings, to secure the segments from moving. A certain amount of heat will build up when running these antiques, and the commutator segments have a habit of 'loosening up' and the brushes will catch on a segment and 'fly' apart.
I understand this is for the vertical, aka drum, commutators along the shaft.
Does anyone have any pictures of a completed application? I would be interested to see how much epoxy is actually applied and its actual location. Guess I’m hesitant to apply without seeing an example first!
