The hinged connection between the jaws of the second clamp allow {HEAD ~ the second clamp} to move from the closed position to {TAIL ~ the open position} 
to move to
The hinged connection between the jaws of the second clamp allow { HEAD ~ the second clamp } to move from the closed position to { TAIL ~ the open position }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL