This is not really a fettle, I just wanted to see if I could make a roarer burner with regulator from scratch. This is what I did. Dome a circular piece of brass (with towing hitch ball or similar) to make the bottom of the vaporiser . Prepare top and bottom vaporiser pieces for brazing. Braze with silver braze and clean up. I keep old 'base nuts' from knackered burners. When cleaned up with a cap soldered on they make great travel caps. This time I incorporated one into this burner. (I used copper plumbing tubing instead of brass as it's what I had available.) Make the two inlet tubes with the correct length and shape, and braze them to the 'base nut' at the correct angle so that the other ends mate with the underside of the vaporiser. Then drill two holes in the underside of the vaporiser for the inlet tubes, and a align the free ends of the inlet tubes (suitably angled) over the holes in the vaporiser and braze. Then fit the regulator barrel (shown in the post here) to cradle between the inlet tubes and measure and make the outlet tubes to fit the barrel and underside of the vaporiser. Then drill the holes for the outlet tubes in the vaporiser, and fit and braze the tubes to the regulator and vaporiser simultaneously. Then braze the lugs on to the inlet tubes to hold the flame ring. Here it is fitted to the SVEA tank Flame distribution is even around the domed vaporiser. and flame with the flame ring fitted and regulated back to a 'pilot' flame. The key to successful brazing (IMHO) is in the preparation. I am in no way an expert, but I have found that if I make sure that the tubes ends are contoured correctly and that the mating surfaces are clean and fit together as perfectly as possible, then the actual brazing is relatively easy. Have fun!