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 long do tension springs last on garage doors under normal conditions? We have a single door and one side is against the wall of the wooden interior [90+ yr old home-detached garage]. The company guy that put our garage door in years ago left a long nail in the wood on the side of the garage which was catching onto the spring halfway and stopping it from stretching 100% over the yrs....