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