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