Stevekauss, as WD40 was used and is flammable, there is not much that can be done aside from cutting the piece out. If WD40 had not been used and gas was able to come through the orifice, a flame could have been ignited long enough to heat the metal. Once heated for a minute, a channel lock could have been used to remove the burner head down to the hex nut, and a damp cloth placed in the center tube to cool the venturi and cause it to "shrink". This would have allowed the threads to turn loose.