{TAIL ~ The clamp plate extension} has a concave, circular toothed depression forming one half of {HEAD ~ a socket} to hold a ball 
{ TAIL ~ The clamp plate extension } has a concave , circular toothed depression forming one half of { HEAD ~ a socket } to hold a ball
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH