An attenuator for optical signals includes a base. The starter motor includes a rotor having a permanent magnet fixed to an inner peripheral surface of a peripheral wall of the crank pulley, and a stator having a coil fixed to an outer surface of a chain cover. The slope of the pressure line is then used in a flow equation to determine the amount of gas that flows out of the anode sub-system, which can be through a valve or by system leaks. A fluid is injected into the feedstock material to create a cavity in the feedstock material and to force the feedstock material into contact with the inner surface of the mold.