When ordering our bifold door from Schweiss, I paid a little extra ($90, I think) to have a manual backup in case the power went out and we needed to get the plane in or out. What we got was that little handle sitting on top of the motor: To get the door up, you take the top cover off the motor, insert the crank and start cranking. And cranking, and cranking, and cranking. All the while, the door and motor is going up, necessitating a ladder or scaffolding to keep cranking as it goes up. The contractor said he started the process to be clear on the concept, but thought it would take hours of cranking to get the door open - not good if let's say a storm is approaching and you need to get the door up or down with the power off. He said the force required was high, maybe too high for a power drill to work. A standby generator might work, but its 240v and high current, so it would have to be a big one. In any case, the contractor thought it was the dumbest thing he had ever seen. I think I agree. What do you think?