{HEAD ~ a cam surface} located on {TAIL ~ an exterior portion} of the tieback member in engagement with an inner side of the locking member 
{ HEAD ~ a cam surface } located on { TAIL ~ an exterior portion } of the tieback member in engagement with an inner side of the locking member
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH