Well, I figured I had to get inside somehow. There were multiple screws to remove to open the generator and most had rusted firmly in place. Mix went out and bought some liquid wrench, but that did not work. I drill Ed the heads off of two screws and that allowed me access. Mi put the knob back in place and all works. The case is pretty dented and banged up, but who says it has to be pretty. I suggest Bradley use screws that don't rust.