The bottom of a Brasso tin is concave/convex. It's ideal for a meths burner top, so this gave me a chance to practice my brazing skills. It's the brazing sequence that is crucial not the brazing technique. I used three brazes; the Silverflo 20 has the highest melting range, then Cu-P, then Silverflo 55. First, 2mm holes are drilled around the cut-out Brasso tin bottom (16 holes) and then the flat base is brazed on with Silverflo 20 and Easyflo flux. Then the bottom copper fuel/air feed tube is drilled for the 'up' tube connection and squashed flat and sealed with Cu-P braze (no flux), and then the 'up' tube is brazed to the burner base and the feed tube with Silverflo 55 and Easyflo. Next the overhead fuel pipe is squashed to fit the top of the burner. Then the 'down' tube has the horizontal hole drilled and is brazed to overhead pipe with Cu-P. When all the tubes are clear of flux and debris the bottom of the down tube is sealed with Silverflo 55, and the overhead pipe is filled with a suitable wick (in this case glass mineral wool). A tray for the priming liquid meths, and very soon vaporisation in the 'generator' occurs Another fish smoking burner for the Abu Roken.