If I remember correctly from shop class half a century ago we rebuilt a brushed generator.? ?We were cautioned about reversing used brushes in their slots because "slop" allowed the brushes to cant a small amount.? ?This cant meant the ends of the brushes wearing on the rotor ended up giving the brushes a wedged bottom which if reversed could cause jamming, breakage, or other unwanted problems.? I'm not sure but this might also happen if you reversed the direction of the rotation.? I am not an engineer, but thought it might be something to consider in using brushes in your application.? Being old school, I usually prefer something I can fix as opposed to "discard and replace ".? ?FWIW
