The Symptom
One side of the door hangs lower than the other, or it won't move at all. You might hear a loud bang followed by the door sagging crooked in the opening, or see a cable frayed into little wire hairs near the bottom bracket or the drum at the top.
Lopsided jerking on lift
Sometimes the door looks fine sitting shut but jerks hard to one side the moment the opener pulls it up. All of that points to a lift cable that's stretched, frayed, or already snapped off its drum.
Never run on one cable
It is not a problem to force through with the opener - running a door on one working cable twists the track and bends the section it's hanging from. Fort Collins homeowners usually notice this in the middle of winter, right when they need the door most.
Cold-morning cable failure
A cable that's been quietly fraying for a year will often give out on the coldest morning of the season, because cold wire has less give left in it when the door takes its first hard cycle of the day.

Why This Fails Locally
Most of the garage doors we work on across this service area sit in homes built between 1975 and 2012, with the bulk of that stock going up in the 2000s. That matters for cables specifically: galvanized lift cable has a working life measured in cycles and years, and a huge share of these doors are now old enough that the original cable is at or past the point where strand failure starts. You don't get a warning cable change on a schedule - you get one strand snapping at a time until the cable can't hold.
Fort Collins sits in a severe cold climate band, and cold wire behaves differently than warm wire. Galvanized steel stiffens as temperatures drop, and a cable that's already lost a few strands to age has far less margin left when it's also brittle from cold. We see the failure spike in the coldest stretches of winter - not because the cable changed overnight, but because the slack it had in October is gone by January. Houses with doors facing north or sitting in a shaded spot off the sun tend to hold that cold longer through the day, which is exactly where we get more of these calls.
Parts We Carry
We stock lift cable in the gauges and lengths that match the doors common to this area's housing stock from the 1975-2012 build range - both standard 1/8-inch and the heavier 7x19 cable used on taller or double doors. We also carry the drums, bottom brackets, and safety cable that go with a cable job, since a cable rarely fails alone; the drum groove it was riding in is often worn from the same years of use.
What we don't stock is every proprietary cable length for every production-line door ever built. If your door is an uncommon import or a custom shop build, we may need to order a specific length rather than pull it off the truck, and we'll tell you that up front instead of forcing a part that's close but not right. On a standard torsion-spring door from the typical 2000s-era build common here, we're usually carrying what the job needs.
What the Fix Involves
A cable job starts with releasing tension safely - the springs on a torsion system hold real force, and that's the part of this repair that should not be a DIY afternoon.
Replace both cables together
Once the door is secured and the spring tension is off, we pull both old cables, not just the broken one, because if one side failed from age or cold-brittleness the other side is on the same clock.
Inspect drums for grooves
We check the drums and bottom brackets for wear grooves while we're in there, since a new cable riding in a chewed-up drum groove will fail again faster than it should. After the new cables go on, we reset spring tension, balance the door, and run it through a full cycle check - looking for even travel, no lean to one side, and the opener engaging without strain.
Hidden opener motor cost
A door that's balanced right puts almost no load on the opener; one that's still fighting a bad cable path will burn out the opener motor early, which is the hidden cost of letting a cable problem sit.
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