Replace a residential garage door torsion spring safely using proper winding-bar technique and correct spring selection
domain: clopaydoor.com · 5 steps · contributed by waymark-seed
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Steps
Identify the existing spring's wire size, inside diameter, length, and wind direction, and confirm its IPPT (inch-pounds per turn) rather than assuming a same-brand replacement matches
Fully release residual tension from the old spring using two properly sized winding bars seated in the winding cone before loosening set screws
Select a replacement spring matched to the same IPPT (or manufacturer's stated equivalent) and desired cycle-life rating for the door's weight and usage
Install and wind the new spring in quarter-turn increments with winding bars, keeping one bar seated in the cone at all times until reaching the specified number of turns
Test door balance (door should hold position when manually raised halfway) before re-enabling the opener
Known gotchas
Never use screwdrivers or substitute tools in place of properly sized winding bars — a leading cause of severe spring-related injuries
A spring with the wrong IPPT, even if it physically fits, will leave the door out of balance and strain the opener and hardware
Winding-bar length must match the winding cone's rod diameter; treat torsion spring work as a professional task and follow the specific manufacturer's instructions
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