the same direction against the bias of the spring 166 the member 160 slides into the passage 162 during this action a slight amount of bleeding may occur by way of the passages 167 from the right side of the piston to the left side thereof during a charging action the rod 36 disengages from the piston 130 and more substantial fluid communication occurs in this case from the left side of the piston to the right side to move the piston back towards its equilibrium position under the force imposed by the spring 166 fig1 18 show a eighth embodiment of the present invention wherein the primary support for the mass 34 is directly from the mass and not the end support rods 36 this embodiment also employs support rods 30 having associated therewith end securing nuts 31 fig1 illustrates a top rod 30 which supports blocks 170 the bottom rod 30 supports a u shaped member 171 fig1 shows the side view of these members a threaded pin 172 is used to secure the blocks 170 to the mass 34 with the blocks 170 capturing the rod 30 similarly the bottom member 171 is secured by a threaded bolt 173 to the mass 34 the u shaped member 171 maintains the proper positioning with regard to the mass 34 and its associated rod 30 thus the movement left and right in fig1 of the mass 34 is under the guidance of the support blocks 170 and the guide member 171 in the embodiment of fig1 the mass 34 has no end rods extending therefrom instead there.