My car is now in my garage! This evening I dragged C, who is a very tall person (not to mention wonderfully kind and helpful), into the garage to help out. He was actually able to reach the top of the door without a ladder, and between my pushing it into the right position from the bottom, and his maneuvering from the top, he quickly got it back into the track. woo-hoo! I adjusted the tension so that it would open under its own power, and then we did some tightening up of the door's track, and the molding by the door, to stabilize the whole thing. I think it's much better now. And it opens and closes, on command! Very pleased. Happily drove my car into the garage, when we were through, and closed the door behind it. More snow is expected tonight, so a working garage is a Very Good Thing!