pendulum principle(Straigh hole is accomplished by applying one or a combination of three basic principles: the stabilization principle, the pendulum principle and the falcrum principle. Johnny Bravo)
fulcrum principle(Straigh hole is accomplished by applying one or a combination of three basic principles: the stabilization principle, the pendulum principle and the falcrum principle. Johnny Bravo)
stabilization principle(Straigh hole is accomplished by applying one or a combination of three basic principles: the stabilization principle, the pendulum principle and the falcrum principle. Johnny Bravo)
