for example according to one embodiment the shuttle piston 128 is separate from the lower piston 130 such that the travel of shuttle piston 128 is restricted to a down stop not shown and will not interfere with the operation of the secondary piston 130 for example be restrict from movement across flow path 140 once the shuttle piston 128 shifts the seals of the secondary piston 130 into service the previously dormant seals of the secondary piston 130 will assume hydraulic operation when valve 142 is activated to allow flow to path 140 primary hydraulic system 110 and secondary hydraulic system 126 are located in separate chambers within housing 36 although many configurations are possible according to one embodiment the primary hydraulic system 110 is located on an opposite side of the housing 36 compared to the secondary hydraulic system 126 both the primary piston 112 and the lower piston 130 are in operative communication with the flow tube 59 such that downward movement of either the primary piston 112 or the lower piston 130 causes downward movement of the flow tube 59 further lower piston 130 is independent or redundant of the primary piston 112 such that downward movement of the flow tube 59 is effected either.