Thanks for responding. I'll get a pix in tomorrows daylight. Sorry I made it so confusing. The bolt holds a half moon gear in place so when the door opens the motor turns , turning the half moon gear and either extends or retracts the steps. The thin metal bracket that holds wires and clips would have to be removed to access the 'socket' that the bolt sheared off in, under the units . I'll clicka pix of the bolt to give you a size estimate. Thanks again. My inability frustrates me, so I really do appreciate you sharing your wisdom.