discharging a fluid from the fluid assembly into the cavity and in contact with the body in order to fill the cavity to {HEAD ~ a second position} achieving {TAIL ~ the known volume} wherein the inner layer is positioned away from the body in the second position 
discharging a fluid from the fluid assembly into the cavity and in contact with the body in order to fill the cavity to { HEAD ~ a second position } achieving { TAIL ~ the known volume } wherein the inner layer is positioned away from the body in the second position
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 HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH