This cone has notches in it that are used to adjust the tension in the torsion spring.
How to adjust tension on garage door torsion spring.
Look for a reddish cone on the torsion spring.
This is accomplished by opening the garage door as fully as possible until it hits the stop bolt on the track.
You must release the tension on the garage door springs before attempting adjustment or replacement.
Install a vertical two by four brace at the outer edge of the door to prevent the door from falling.
Hold the garage door in this position by attaching a c clamp to the track at a point below the lowest door roller wheel.
To adjust your garage door s side mounted springs first open your door fully and secure it in place with a c clamp below the bottom roller.
This video applies t.
Open the door fully to relieve the tension on the hinge springs at each side of the door opening.
Once your garage door is secured remove the spring hook from the track hanger which will allow you to move the hook and adjust the spring s tension.