an insulation cap coupled to {HEAD ~ the main plate} to define {TAIL ~ a flame space} with the main plate 
to define
an insulation cap coupled to { HEAD ~ the main plate } to define { TAIL ~ a flame space } with the main plate
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH