Hardware store spring mismatch
The honest answer on DIY: don't. A wound torsion spring under tension can break a finger or worse, and the spring size on a door built around 1979 is often not what's sold at a hardware store today.
North River Shores, Stuart
North River Shores spring repair from Stuart Garage Door Pros. Built mostly in 1979, this small river community has a narrow range of spring sizes and a lot of neglected doors.

DIY or pro
North River Shores is a small place, about 1,581 households tucked along the river, and that matters for how we talk about this job. A town this size doesn't have a dozen garage door outfits fighting over it, so a lot of homeowners here have never had a spring replaced and don't know what a torsion spring costs to swap versus what a new opener costs.
The honest answer on DIY: don't. A wound torsion spring under tension can break a finger or worse, and the spring size on a door built around 1979 is often not what's sold at a hardware store today.
If you're the type who changes your own oil and wants to know what's involved before you call anyone, fine - but this isn't a brake pad job.
The wind-up bars, the winding cones, the shaft alignment all have to be right or the door comes down crooked, and crooked under tension is how people get hurt. We'll walk you through what failed and why if you want to know. We just won't talk you into doing the winding yourself over the phone.
Downtime
We're based in Stuart, about 3 miles from North River Shores, so getting a truck here isn't the holdup - parts availability usually is. A broken spring itself we generally carry in common sizes on the truck. What slows a job down in a neighborhood like this, built mostly around 1979, is when the opener or the track hardware is original and a replacement part has to be ordered rather than pulled off the truck. We won't promise a same-day fix sight unseen, because we don't know what we're dealing with until we see the door. What we can tell you: most spring-only jobs on a standard double door don't require ordering anything, and the 3-mile run from Stuart doesn't add meaningful time to the visit.
On the truck
The housing in North River Shores clusters tight around 1979, which narrows down what we expect to find under the hood of a garage door here.
Torsion springs from that era were often sized for lighter, single-layer steel doors - lighter than what's sold now - so if a prior repair put in a spring sized for a heavier modern door, you can end up with a door that slams down hard or won't stay up on its own.
We stock standard torsion spring sizes, extension springs for older side-mounted setups, and the cable and drum hardware that tends to fail alongside a spring rather than before it.
What we don't stock on the truck is anything custom-wound or sized for a door that's been modified from its original setup - those get ordered, and we'll tell you that up front rather than guess.
Watch-outs
The mild coastal climate here is easier on steel than a lot of the country gets, but it isn't nothing - humid air near the river still speeds up rust on a spring's coil ends and on the cable where it wraps the drum.
Where we see jobs go wrong is when a homeowner or a handyman replaces just the broken spring on a two-spring door and leaves the second, unbroken spring in place.
That second spring is the same age and has done the same number of cycles - it's close behind. We'll point this out and let you decide, but a single spring swap on a door that old is a half-measure more often than not.
The other way these jobs sideways: skipped cable inspection. A fraying cable on a 1979-era door is common enough that we check it every time, not just when it's obviously frayed.
The repair
For a straightforward torsion spring swap, the work itself is a couple of hours on site once we've got the right spring on the truck, which for a house in this area built around 1979 is the common case rather than the exception. We unwind the old spring, check the shaft, drums, and cables for wear from the same years of use, replace what's failing alongside the spring, and rebalance the door so it holds position at any height by hand. Median household income in this area runs higher than the wider Stuart service area, and we mention that only because it means we don't see people putting off a second spring or a worn cable to save money the way we sometimes do elsewhere - it's usually fixed right the first time rather than patched.
Questions
It's not dangerous to leave the door alone with a broken spring - just don't force it open or closed with the opener, since that strains the opener motor and track. Call when you can; we come from Stuart, about 3 miles out, and most spring jobs here don't need same-day ordering.
If a prior repair put in a spring sized for a lighter, older-style door, or only replaced one of two springs, the remaining or mismatched spring carries more load than it should and fails early. We check both springs and the sizing, not just the one that snapped.
Most houses here date to around 1979, and we stock torsion and extension spring sizes common to that era on the truck. Custom-wound springs or heavily modified doors sometimes need an ordered part, which we'll confirm before we start.
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Stuart Garage Door Pros repairs and installs garage doors, springs and openers in Stuart, FL and the surrounding area.