This is the one garage job the trade itself tells homeowners to skip. A wound torsion spring holds enough stored energy to drive a winding bar through a hand or a face, and spring injuries are a steady emergency room category every year. The parts are cheap and the labor is the knowledge of how not to get hurt. Cables under spring tension carry the same warning. Rollers, hinges, weather seal, and sensor alignment are reasonable DIY; springs and cables are the line.
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