Whatever type you have, those springs have a finite number of openings and closings they can do before they fatigue. We just had one of ours break within the last 6 months. The repair man replaced both, since there is a good chance that if one fails, the other will also. He said that most springs will handle around 10,000 openings and closings. If you are like we are, you use the garage door rather than the front door, so ours opens several times a day. He also said that his business has had two repairmen killed in the past year. When those springs go, they can act like a gun shot. So please be careful.
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One of mine broke a number of years ago. When the garage door repair man fixed it, he said that sometimes people come down to the garage in the morning to get in their car, and find the windshield is shattered. They find a piece of the hook in their car, and the spring disengaged.
We went out and bought new springs, along with safety cable that runs inside the spring, so if/when the spring snaps, it stays in place instead of shooting off who knows where.
It turns out that the springs we got may be too strong for our rig-up. The garage door is not closing entirely (just barely). I may have to go back to the Depot tomorrow to get a lower gauge spring - 150lb instead of 160lb. We'll see, maybe the springs will loosen up a smidgen.
PS
Tomorrow we're going to this.
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