{HEAD ~ A deformable diaphragm} 4 is clamped between {TAIL ~ the ring} and the structure 
{ HEAD ~ A deformable diaphragm } 4 is clamped between { TAIL ~ the ring } and the structure
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH