Leg members 474 and 476 function both as {HEAD ~ a frame} to support {TAIL ~ hook anchor} 464 and together as a horizontal movement retainer to prevent substantial horizontal movement of a hook with respect to hook anchor 464 
Leg members 474 and 476 function both as { HEAD ~ a frame } to support { TAIL ~ hook anchor } 464 and together as a horizontal movement retainer to prevent substantial horizontal movement of a hook with respect to hook anchor 464
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH