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