Short answer: yes, it’s physically possible, thousands of DIYers have done it, and we won’t pretend otherwise. Longer answer: a wound torsion spring stores enough energy to lift a 150-pound door, and it releases all of it in a fraction of a second if a winding bar slips.
Reddit’s most-upvoted garage door thread ever is a video of what a torsion spring does to a cantaloupe standing in for a human head. The second most famous one is titled “Looks like an easy DIY fix” — followed by the edit: “Just kidding, I’m not insane. Professionals will be here tomorrow.” He paid $395 for both springs and called it worth every dollar. Between those two posts sits the whole honest picture.
The pattern repeats like clockwork: in August 2026, yet another “got new parts, doing my own spring swap” post shot past 4,500 upvotes on r/homeowners — and the top-voted takeaway, once again, was the author conceding the winding bars were staying in the box and a professional was coming. When thousands of DIY-friendly homeowners keep reaching the same conclusion about the same job, that is data.
What the job actually involves
Replacing a torsion spring means unwinding a loaded spring with steel winding bars, swapping it on the shaft, rewinding it to a precise turn count, and re-tensioning the set screws — all on a ladder, with your hands inside the arc the bar travels if it slips. It is not complicated. It is unforgiving. Those are different things.
The three moments people actually get hurt
- Wrong tools in the winding cone. Screwdrivers and rebar instead of proper winding bars. The bar slips out of the cone under load — this is the classic injury.
- Loosening set screws before taking the tension. The spring unwinds instantly, spinning the bars with it.
- Standing in the plane of the bars. If a bar lets go, it travels in an arc. Standing to the side is the difference between a scare and an ER visit.
Extension vs. torsion: the one semi-DIY case
Older doors with extension springs (stretched along the tracks, not wound above the door) can be replaced with the door open and the springs fully relaxed — a genuinely lower-risk job if you clamp the door and use safety cables. Torsion springs, mounted on the shaft above a closed door, never fully relax. That’s the type this warning is about.
The honest math
| DIY | Professional | |
|---|---|---|
| Parts | $60–$150 (pair, online) | Included |
| Winding bars | $20–$50 (one-time) | — |
| Time | 2–4 hours first time | Under 1 hour |
| Wrong-size risk | On you (wire gauge, length, wind direction) | On us |
| Warranty | None | 2+ years, product-dependent |
| Total | $80–$200 + the risk | $250–$500 for the pair |
If your time is worth anything and your hands are how you earn a living, the math rarely favors DIY — which is why even the r/DIY consensus, on a forum built for doing things yourself, is “don’t.”
If you still DIY: 5 non-negotiables
- Real winding bars, sized to the cone. Never screwdrivers.
- Unplug the opener and clamp the door to the track.
- Body to the side of the cone, never in the bar’s arc.
- Match wire size, length, inside diameter, and wind direction exactly.
- One bar always fully seated before the other moves.
Frequently asked questions
How do I know the spring size?
Wire gauge, inside diameter, and length are measured off the old spring — but a broken spring’s gap must be added back. Measuring wrong means a door that won’t balance.
Right-wound vs. left-wound?
Each side of the center bracket takes the opposite wind. Installing them swapped is the most common DIY mistake — the door lifts crooked or not at all.
Should I replace both if one broke?
Yes — both have the same cycles on them. See our spring cost guide.
Rather not? Fair enough — it’s what we do all day. Same-day spring replacement across Orange County, itemized quote before we start. Call or text.
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