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