The arm does its job well, but the tether ball does not allow it to be attached on the upper part of a tripod, too narrow for the ball can squeeze the amount. We must therefore place it on the lower part, which requires disassembling the ball to go in amount. In addition, whenever you want to change the position of the arm and thus open the ball, she disassembles completely because the central screw is too short. I have remedied somewhat by drilling in the plastic to allow the handle clamping screwing more (going further), which allows me to free rotation without undo too (hence my handle remains on the central screw). To put the ball on the highest part, you will hack, like putting a felt or cardboard around the arm for proper tightening. Is probably better to opt for a tie on the top screw foot ... see other models
