An opening in a first end of the shell enables a male center pin to be inserted into the connector to make {HEAD ~ contact} with {TAIL ~ the collette} 
An opening in a first end of the shell enables a male center pin to be inserted into the connector to make { HEAD ~ contact } with { TAIL ~ the collette }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL