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