Vertical movement retainer 468 includes surface 469 which functions to block substantial vertical movement of {HEAD ~ a hook} with respect to hook {TAIL ~ anchor} 464 
Vertical movement retainer 468 includes surface 469 which functions to block substantial vertical movement of { HEAD ~ a hook } with respect to hook { TAIL ~ anchor } 464
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH