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