an elongate lever member for manipulating said {HEAD ~ control line} and having a pivoting extremity and {TAIL ~ a free extremity}, 
an elongate lever member for manipulating said { HEAD ~ control line } and having a pivoting extremity and { TAIL ~ a free extremity } ,
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH