Menus are sometimes hierarchically organized, allowing navigation through different levels of the menu structure. Selecting a menu entry with an arrow will expand it, showing a second menu (the sub-menu) with options related to the selected entry.
Torsion springs are normally mounted horizontally above the opening of your garage door. When you pull the door down, cables attached to the bottom corners actually force the springs to wind up, in turn energizing the system.
Swing-up garage doors move on horizontal tracks. The power spring is mounted on the door frame and hooked to the door. Caution: If a roll-up door has only one torsion spring, at the center of the door, do not try to repair it. The tension is so great that the spring could injure you.For doors with this type of spring, call a professional repair service.wing-up garage doors move on horizontal tracks. The power spring is mounted on the door frame and hooked to the door. Caution: If a roll-up door has only one torsion spring, at the center of the door, do not try to repair it. The tension is so great that the spring could injure you.