The principle of the slingshot inner wear cocktail leash?

Inside wear and cocktail principle is actually nothing complicated, spreading the leather band when the front section of the heavier leather band first recovery, driving the leather pocket in the steel O first action of the first step, and then the back section of the lighter leather band followed by the recovery Restore the original shape, thus playing the second force, the formation of speed superposition, so out of the speed than the general leather group to be a lot faster, and the trajectory to go more straight away,