Use the original cold weld formula JB Weld, with one red tube and one black tube.
Scratch up the surface area all around the broken spot by cutting it up with a sharp knife. Pile on the glue to span the brake so you have more gluing area than just the edge of the brake. You may have to make a dam for the glue around the area as this a glue that will run off vertical surfaces or puddle out. After a few hours when it should begin to harden up, a 60 watt lamp bulb can be used to speed up cure. If not wait at least 12 hours or more to cure. The catalyst in the red tube causes heat to harden. Mix at 50/50 for top strength, more than 50% red tube catalyst will weaken bond.
The motor should be made from cheap plastics that JB Weld works great on.
Charlie
