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