Why This Fails Locally
Most of Burlington's housing went up around 1971, and that's the detail that matters here before anything else. Doors from that era were almost never built with torsion springs mounted on a shaft overhead. They run on extension springs stretched along the horizontal tracks, with a galvanized lift cable looped over a pulley at the bottom bracket on each side. That setup works fine for decades, but the cable itself is the weak link - it's thinner wire, under constant tension, bent sharply around a small pulley wheel thousands of times a year.
New England's cold snaps make it worse. Galvanized cable stiffens in hard cold, and stiff wire doesn't flex at the pulley the way it does in warmer months - it cracks at the bend instead. We see this pattern across Burlington more than we'd see a clean torsion-drum failure, because the housing stock here skews toward that older extension-spring style rather than the torsion setups more common in newer construction. If your door suddenly drops crooked on one side in January, this is usually why.
Stocked Parts
We carry galvanized aircraft cable in the diameters and lengths that match extension-spring doors from the 1960s and 70s - both loop-end and clip-end styles, since Burlington's housing mix means we run into either on a given job. Standard 7x19 cable in the common gauges rides on the truck, along with safety cables for the extension springs themselves, which often need replacing at the same time if they haven't been upgraded yet.
Here's the honest limit: if your door uses an odd cable length from a manufacturer that stopped making parts years ago, or a torsion drum cable sized for a non-standard door width, we may need to order it. That's not common on the extension-spring doors typical of this area, but it happens on custom or oversized doors, and we'll tell you straight if that's your situation instead of promising a same-visit fix we can't deliver.
Time on the Job
Burlington sits about 3 miles from our shop in Woburn
So getting a truck to you isn't the long part of the visit - diagnosing which side failed and whether the drum or pulley took damage along with the cable is. A straightforward frayed cable on one side, with the pulley and drum still sound, is usually a single-visit repair.
- 3 miles
If the cable snapped and let the door drop hard
We also check the tracks and rollers on that side before calling the job done, since a hard drop can bend a track just enough to bind the door later even after the cable's replaced.
The Symptom
The giveaway on extension-spring doors is a door that hangs crooked - one bottom corner lower than the other - or a door that won't move at all because the opener senses the imbalance and stops. Look at the bottom bracket on each side: if you see loose wire strands poking out near the pulley, that cable is close to going, even if it hasn't snapped yet.
A full snap usually comes with a loud bang and the door dropping suddenly, sometimes jamming partway in the track. Don't try to force it up by hand or run the opener again - with the cable gone, the spring's full tension has nowhere predictable to go, and that's how fingers and door panels get hurt.
