Small cables, enormous job
The two steel cables running down the sides of your garage door transfer the springs' lifting force to the bottom corners of the door. They're wound from aircraft-grade steel strands, but they live a hard life: thousands of lift cycles under load, moisture at the bottom bracket, and grit from the garage floor. When a cable frays, jumps its drum, or snaps outright, the door cocks sideways in the tracks, jams at an angle, or — in the worst case — falls with nothing controlling its descent. A door hanging by one cable is a genuine safety hazard for anyone walking under it.
