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