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