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