Turnbuckles(TB-E/E) are most commonly used in applications which require a great deal of tension,widely used in aircraft. A turnbuckle, stretching screw or bottlescrew is a device for adjusting the tension or length of ropes, cables, tie rods, and other tensioning systems. It normally consists of two threaded eyelets, one screwed into each end of a small metal frame, one with a left-hand thread ...