{HEAD ~ The device} is {TAIL ~ a cage} made from high security steel cable that opens to admit the helmet to be captured therein and closes around the helmet to secure the helmet within the cage 
is
{ HEAD ~ The device } is { TAIL ~ a cage } made from high security steel cable that opens to admit the helmet to be captured therein and closes around the helmet to secure the helmet within the cage
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH