Does anyone have experience with these doors? It appears that the shaft where the motor connects to the gear box has sheered off. I am not sure if the motor could be salvaged by getting that piece of the shaft out. I am also not sure what could have caused this other than a faulty shaft. When I arrived it did not seem as if the door was jammed and i would imagine that even if it was that much force would have damaged other things. I am hoping i can find the whole assembly of motor and gearbox so that i can get this going asap and then maybe look in to rebuilding the old one. I believe its 460V