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.
How It Works: Garage Door Opener. The garage door dies some time during its 13,476th operation, while it's being closed. It goes out without much dramaâthere's no audible snap as the torsion spring breaks, no parts dangle loose in telltale failure, and the motor sill lights up, strains and stops.