the one shown for the first embodiment in this embodiment hydraulic chambers 87 88 can be driven upward or downward so as to change the relative location of the stop cock portion 90 of the needle valve 85 the hydraulic chambers 87 88 are formed on the bottom side of the lower diaphragm and are further defined by a longitudinal opening in the bottom compliance member 21 39 in the present invention the fluid container comprised of the upper diaphragm and lower diaphragm is preferably a heat or chemical sealable polymer having the required tensile flex elongation and fluid resistance properties the specific examples including polyethylene and polypropylene the upper and lower compliance members are an elastomer having the proper physical characteristics and being premolded in halves for ease of assembly and to allow for greater internal detail the mount may be assembled by first assembling the fluid package container with the internal divider plate in place as has been previously discussed it is advantageous to provide a fluid type seal such as a heat seal at the sealing flanges of the upper and lower diaphragm the fluid package container may subsequently be filled with fluid such as by a fill and evacuation technique through the fill port 36 once filled the fluid package may be tested for fluid or air leaks further this may be accomplished in the present invention prior to implanting into the mount the fluid package.