some people like the molded stator, but i think the rubber just keeps the heat in, and they get hotter than a regular stator, so i like to use the unmolded ones. no, you cannot glue the magnets back on the rotor. if those magnets explode out of the rotor while running at road speed, they can go right through the inner primary into your leg, or worse. buy a new one. even if the rotor magnets look good, but it has been dropped or otherwise struck by something, replace it