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Installed in 2003, problem, with no door hooked up, motor is unable to turn screw for more than a few seconds. Torque adjustments (up and down) full clockwise. Disconnecting screw and rail from motor, I have a very difficult to turn screw. Cleaned all the old grease out of channel in rail and screw itself. Three section rail and screw. Genie could only suggest loosening the 8 bolts holding the 3 sections of rail together but this did nothing to help. Seems to me that screw should turn freely in the extruded aluminum rail. Can not see any burrs, damage, or bent parts. How to find why screw is hard to turn? Suggestions?