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Let some penetrating oil seep onto the Field Housing bolts overnight, and then smack them with an impact wrench.
I once jury-rigged a wooden peg and some rubber bands to temporarily squeeze a brush into a holder. I'm certain a professional motor repair guy would have crapped his pants if he ever saw that. It was just to bench test the motor to see if it was worth working on. You also could jumper across the brush that has the broken spring with it's opposite mate, and simply test run the motor with two brushes.
Motors sizes are most often referred to by their diamater.
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