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Why aren't counterweights used more for garage doors?

Torsion springs are nice because they take up relatively little room on the ceiling of the garage, as opposed to counterweights, which would need space to travel vertically and a footprint in which to … With torsion springs, if one breaks, it stays within the shaft/tube that it's mounted to. If an extension spring breaks, it can go flying anywhere in a garage (unless restrained by safety cables). …
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