{HEAD ~ A self centering construction} 19 wherein said axial movement means comprises a second liquid spring operable in tension and compression on each of {TAIL ~ said liquid springs} 
{ HEAD ~ A self centering construction } 19 wherein said axial movement means comprises a second liquid spring operable in tension and compression on each of { TAIL ~ said liquid springs }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL