A garage door should not be opened until the spring is repaired.
Release garage door spring.
To remove extension springs open the garage door all the way and attach c clamps or locking pliers to the tracks on both sides to prevent the door from rolling down once the springs are removed.
The size of the door and the type of spring system determines how difficult opening the door will be.
You must release the tension on the garage door springs before attempting adjustment or replacement.
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This is accomplished by opening the garage door as fully as possible until it hits the stop bolt on the track.
Hold the garage door in this position by attaching a c clamp to the track at a point below the lowest door roller wheel.
When the spring unwinds the energy is released causing the door to rise.
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However when you need to get your car out of the garage it may be necessary if you cannot wait for the repairman.