This method can be used to change a door when only a small amount of space is available. A minimum of 3 feet is necessary behind the door. It is also used when the horizontal track is obstructed or covered. Separate door into two halves. This is done by drilling out the top 2 hinge rivets,or by removing the nuts at the break joint Two men are now inside truck .
Place clamps securely in tracks to prevent top section of door from coming down.
As a point of safety, make certain that clamps are tight on track. Close door and lock. When cable is released, this bolt maintains tension on spring. Repeat on opposite side. Remove all rollers down one side of door on lower section.