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