{HEAD ~ A method} 1, wherein {TAIL ~ the retainer} further comprises an extending operation projection, wherein the operation projection extends out of the retainer insertion hole for access to move the retainer to the fully inserted position 
{ HEAD ~ A method } 1 , wherein { TAIL ~ the retainer } further comprises an extending operation projection , wherein the operation projection extends out of the retainer insertion hole for access to move the retainer to the fully inserted position
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH