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