Hi,

I have a 16'x8' two car garage door with an opener. There was some damage to
the rail and so it was repaired by a professional in April. The very next
day one of the two tension spings on the door (See ASCII figure below)
sliped from it grip a the center. We had to call the same guy to retension
it. He said that this was unusual and was not supposed to happen. Today I
find that the other spring has slipped and needs to be retentioned.

Is this common? I have never seen this happen in the last 16 years of home
ownership. Anything I can do to stop this from happening? Of course, the
bolts on the sleeves that connect to the spring can be tightened well.

TIA for any help

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Sleeve Spring Center Hold Spring Sleeve