A perimeter wall extending generally vertically and upwardly from {HEAD ~ the base portion} defines {TAIL ~ the open top} into which the leg is placed during installation 
defines
A perimeter wall extending generally vertically and upwardly from { HEAD ~ the base portion } defines { TAIL ~ the open top } into which the leg is placed during installation
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH