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