Tie the extension spring to the roller track then detach the cable from the bottom bracket with a pair of pliers.
How to install overhead garage door.
The remaining panels and tracks are held in place with hinges brackets and screws.
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Slant or slightly bend the nails to secure them in place.
Once the piece is in place tap nails partway into each jamb.
Release the tension on side mounted extension springs by lifting the door and locking it in place on each side with a pair of locking pliers.
First the lower door panel needs to be set up in the center of the doorway.