The second clamp 14 opens by removing a primary pin and {HEAD ~ a safety pin} in {TAIL ~ the nature} of the first clamp 
in
The second clamp 14 opens by removing a primary pin and { HEAD ~ a safety pin } in { TAIL ~ the nature } of the first clamp
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH