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Subject:  Re: Garage doors & Openers Date:  7/14/2021  8:28 PM
Author:  RHinCT Number:  143780 of 144745

apparently current systems use enclosed springs...

The old style is one coil spring on each side, stretched by cables and pulleys. Hopefully there is a safety wire running through the center of the spring so that if/when it snaps it can't go flailing around. If you have that style without the safety wires I think it is worth having those added.

The newer style is torsion springs mounted horizontally above the door on the inside of the header. The springs are still coils, one for each side, but instead of stretching they are twisted. The cables that lift the door get wound around drums at each end, drums that are attached to the springs. The entire mechanism is pretty much a unit.
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