I just bought this key because I wanted to find a way to adjust the tension of the skin more quickly and accurately. Things done! The principle of the torque wrench is identical to classical setting, ie that the tie rods are tightened in a star until the desired tension of the skin. The difference in uniformity of clamping. Indeed, by tightening, when the tension in the drawing is greater than that of the key, the handle is freed once the clamping point is reached. Then just increase by no resistance to the key until one is satisfied with the result. One thus obtains a uniform clamping, the tie rods have the same voltage and therefore does not obscure the strapping.