{TAIL ~ a portion} of the length of {HEAD ~ said control line} being trained through said passageway and shiftably confined within the latter; and 
{ TAIL ~ a portion } of the length of { HEAD ~ said control line } being trained through said passageway and shiftably confined within the latter ; and
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH