{HEAD ~ The exterior surface} of the ferrule comprises {TAIL ~ a circumferential ridge} and groove that reversibly interacts with a spring inside the adapter cavity 
comprises
{ HEAD ~ The exterior surface } of the ferrule comprises { TAIL ~ a circumferential ridge } and groove that reversibly interacts with a spring inside the adapter cavity
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH