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