Because {HEAD ~ springs} 186 allow {TAIL ~ fluid extension ducts} 182 to be axially displaced, fluid extension ducts 182 are always in contact with the underside of top plate 10 
allow
Because { HEAD ~ springs } 186 allow { TAIL ~ fluid extension ducts } 182 to be axially displaced , fluid extension ducts 182 are always in contact with the underside of top plate 10
OTH HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH