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.
On roll-up doors, the spring tension is controlled by a cable on a pulley. To adjust the tension, pull the cable and reknot the end to shorten or lengthen the cable. Sometimes the problem with your garage door can be traced to the opener. In the following section, we'll show you how to replace a garage door opener.