The end section is non displaceable in its fully inserted position since the notch lies within {HEAD ~ the opening shaft} of {TAIL ~ the flat sleeve} 
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The end section is non displaceable in its fully inserted position since the notch lies within { HEAD ~ the opening shaft } of { TAIL ~ the flat sleeve }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL