I found one cause of a "hard to operate" window winder. As more force is required to wind up the window, the plate holding the two gears bend. This causes the large gear to rub on the plate, which in turn requires yet more force. This cycle continues until something is broken.
The solution is to take it out of door, straighten the plate, clean out the old grease in the channels etc. I have taken the added precaution of reinforcing the plate by welding a strip of metal across the top.
The solution is to take it out of door, straighten the plate, clean out the old grease in the channels etc. I have taken the added precaution of reinforcing the plate by welding a strip of metal across the top.