With mine I noticed that the motor would wobble as it retracted. It got worse until I figured I best look. Got out a ladder and notice that there were two screws attaching it all together. One screw was missing. Replaced screw and presto ! Fixed.
Two screws seems to be standard as that is my situation as well. I have a wobble even with all (both) of the screws in place. Iím thinking of adding two more so that the connection is more stable. Any thoughts?