Dean, My door did the same thing this weekend. I think my problem was from having the garage heated and then when Iwent to open the door, it was partially frozen down. When it jerked up, the cable came off the right side. What I did was get the door all the way down and brace it so you take some of the tension off the spring. With that done, I got on the laddder and rotated the rod with a pipe wrench that the the spring is on so that I could get the cable back on the pulley. Like everyone else said, be careful as there is a lot of pressure on the spring. With mine, I only had to rotate it about 1/2 a turn to get the cable back in place. It works good if you can brace the pipewrench against the header to hold things where you want them while you slip the cable back on. Use a screw driver or pliers on the cable just in case the wrench would slip while you have you hand under the cable. We would really hate to have to start calling you “Lefty”.