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