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