The cage opens via {HEAD ~ a draw string type opening} to capture {TAIL ~ the helmet} therein and closes to prevent the helmet from being removed from the cage 
to capture
The cage opens via { HEAD ~ a draw string type opening } to capture { TAIL ~ the helmet } therein and closes to prevent the helmet from being removed from the cage
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH