The locking device includes a retainer which carries {HEAD ~ a radially movable locking members} that are cammed outward by downward movement of the tieback member relative to {TAIL ~ the retainer} 
The locking device includes a retainer which carries { HEAD ~ a radially movable locking members } that are cammed outward by downward movement of the tieback member relative to { TAIL ~ the retainer }
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL