said slot having a cross section configuration of a type to allow {HEAD ~ passage} of {TAIL ~ said control line therethrough} but preventing passage of said keeper element 
of
said slot having a cross section configuration of a type to allow { HEAD ~ passage } of { TAIL ~ said control line therethrough } but preventing passage of said keeper element
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH