An apparatus 1, wherein the base has an internal chamber and an inlet port for receiving pressurized gas or fluid into the internal chamber such that {HEAD ~ the stems} are biased toward their extended positions by the pressurized gas or {TAIL ~ fluid} 
are biased by
An apparatus 1 , wherein the base has an internal chamber and an inlet port for receiving pressurized gas or fluid into the internal chamber such that { HEAD ~ the stems } are biased toward their extended positions by the pressurized gas or { TAIL ~ fluid }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH OTH OTH REL OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL