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.
However, torsion and extension springs are among the many garage door parts we have in stock. We also sell and ship bearings, brackets, cables, hinges, pulleys, rollers and other tools and hardware.