{HEAD ~ a metallic bolt} fixed to {TAIL ~ the two flanges} and extending generally perpendicularly therebetween 
fixed to
{ HEAD ~ a metallic bolt } fixed to { TAIL ~ the two flanges } and extending generally perpendicularly therebetween
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH