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