I'm rebuilding the motors on a 44 tonner today. Go one running like a champ; the other is still apart. It's in worst shape than the first. Have to rebuild the bearing cap/brush assy., cuz it had a meltdown, the I thot I would be schmadrt and sand the little commuter. Well, it spun on the shaft and ripped the little wires off. I got 'em soldered back on. I immagine when this is over, I'll just sit and drool. Cause of death: over lubrication. Tell yer little plastic folk to go light on the grease...