I built my garage in 1991 and installed the overhead doors myself including twisting up the torsion springs. I went to open the door with the garage door opener the other day and it would keep stalling. I got the key out to the side door which rarely gets used and found that the torsion spring had snapped. I expect it was an impressive bang when it let loose but I didn't hear it. I had heard that there is fatigue life to torsion springs usually in the 10,000 cycle range. Well 28 years that's right around 1 cycle a day so I guess it was getting time. Why do I think my "new house" that I built long ago is slowly turning into an old house . I measured everything up and got two on order as I have two doors and figured might as well have one in stock for when the other one goes. Only thing I need to do is get some new wind up rods and dig out the instructions. The opener is about the same vintage Stanley unit. It had some design flaws that became apparent 5 or 6 years after I installed it. I did some temporary fixes to keep it running for a few more years and have gotten close to another 20 years on it. I just wish it had failed in warm weather.