The exposure of components to high-pressure fluids can result in the application of high tensile stresses to those components, which may lead to reduced life. One method may include activating a template. The user can pull a lever and cause the fins to rotate 180\xb0 and produce thrust in the reverse direction. Then, the predictive engine speed of the engine is computed from the absorbed torque of the hydraulic pumps computed. In a medium that recordsplays back data including video data and control information, the control information includes information for accessing a specific portion of the video data. The securement bolts penetrate through elongated holes in the bracket unit or in the vehicle-stationary part, and the bracket unit in the event of a crash, is displaceable, starting from a starting position, with the displacement of the securement bolts in the elongated holes with respect to the vehicle-stationary part.