A quarter turn at a time will do it.
Tighten garage door torsion spring.
I have been in construction most of my life and i personally know a few garage door installers.
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Remove the winding bars and repeat the process on the other torsion spring before releasing the c clamps and testing the door.
How to safely adjust your garage door spring.
I have worked on torsion springs and i must confess that it made me nervous.
It may take a few trips up the ladder but resist the urge to tighten your door too quickly this can lead to busted springs and serious injury.
This can make the other parts of the garage door last a much longer time.