How to Replace a Garage Door Spring — Plus Why You Probably Shouldn't DIY

    Adam Duce, Limitless Team 25 May 2026 10 min read

    TL;DR — Quick Summary

    Replacing a torsion garage door spring involves clamping the door in the closed position, unwinding the broken spring with two hardened steel winding bars, removing the spring from the centre bracket and shaft, sliding the new spring on, and re-winding to the correct turn count for your door height (typically 7.5 turns for a 2.1m door, 9.5 for a 2.4m). The job takes a trained tech 45–60 minutes. Done wrong, a slipped winding bar can break fingers, wrists or jaws. Australian ED data shows DIY spring injuries are routine. Professional replacement from $290 is the safer call.

    An honest take from a garage door company

    We get asked all the time whether spring replacement is a DIY job. Our honest answer: physically yes, sensibly no. Here's what's actually involved, so you can make an informed decision.

    The full torsion-spring replacement process

    1. Identify the correct replacement spring. Springs are matched by wire diameter (e.g. 0.207"), inside diameter (1-3/4" or 2"), length and wind direction (left-hand or right-hand). A wrong-spec spring will either fail in months or fail to balance the door.
    2. Disconnect the opener. Pull the red emergency release cord. Unplug the opener from power.
    3. Clamp the door. Use a vice-grip C-clamp on the track above a roller, both sides, with the door fully closed. This stops the door from springing up uncontrolled during the work.
    4. Unwind the broken spring. Insert a winding bar fully into the bottom hole of the winding cone. Loosen the two set screws holding the cone to the shaft. With the bar held firmly, let the spring unwind in controlled quarter-turn increments — bar, hand-over-hand, bar, hand-over-hand.
    5. Loosen the centre bracket and cable drums. Mark the position of the cable drums before loosening — they need to go back in the same place.
    6. Slide the old spring off the shaft. Support the shaft as you work — it's heavy.
    7. Slide the new spring on, reattach drums, level the shaft.
    8. Wind the new spring. Calculate turns by door height. Wind in quarter-turn increments with the winding bar, never your hand on the cone directly. Add a quarter-turn at the end to compensate for the cable stretch.
    9. Set the cones, lube the spring, remove the clamps.
    10. Balance test. Lift the door by hand to half-height. It should hold position. If it drifts down, add a quarter-turn. If it drifts up, remove a quarter-turn.
    11. Reconnect the opener and run a full cycle.

    Where DIY attempts go wrong

    The injuries we hear about from Toowoomba Hospital are remarkably consistent. The four common failures:

    • Slipped winding bar. A standard screwdriver substituted for a hardened winding bar bends under load and ejects from the cone at speed. Breaks fingers, wrists, occasionally jaws.
    • Set screw failure. Loosening both set screws before fully de-tensioning the spring releases the entire stored energy in one go. Spring shaft becomes a missile.
    • Wrong-direction spring. Left-hand and right-hand springs look identical but wind opposite directions. Installing the wrong one and tensioning it self-destructs in minutes.
    • Door drop on un-clamped track. Without C-clamps the door tries to spring upward as soon as the new spring is tensioned. Anyone underneath gets a 50–110kg surprise.

    The real economics

    A pair of decent residential torsion springs costs $80–$140 retail in Australia. Genuine winding bars are another $35. A professional replacement at Limitless is from $290 supplied and installed, or from $390 for a matched pair including balance check, cable inspection and warranty. The "saving" is maybe $150 — and only if nothing goes wrong. One ED visit is $400 just for triage and X-ray.

    When DIY actually makes sense

    We won't pretend nobody should ever do this. If you're a qualified mechanical tradesperson, have proper winding bars, have done it before under supervision, and have replacement springs of the correct spec in hand — go for it carefully. For everyone else, get us out.

    Need a spring replaced in Toowoomba, Ipswich, Highfields or anywhere on the Darling Downs? Call (07) 4615 4481 — same-day callouts standard.

    About the author

    Adam Duce is the founder of Limitless Garage Doors & Gates (formerly Darling Downs Garage Doors & Gates), based in Harlaxton, Toowoomba. Adam has been installing, repairing and automating garage doors and gates across the Darling Downs, Lockyer Valley and South East Queensland since 2015. The Limitless team are authorised dealers for B&D, Steel-Line, Gliderol, Merlin, Centsys and Grifco, with 4.9 stars across 241 Google reviews.

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