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I have stripped down my retort so that the pictures are self explanatory. this is a very, very sucsessful model. Materials needed: 2 x 44 gal Drums(removable top type) 6 ft 4" pipe(1 x 2ft & 1 x 4ft ) 1.5ft 6" pipe some 1/2" square bar or what have you to make fire grate 1 x 4-6" bell mouth 1 x 6" flange any type a piece of plate 1/4" for base of drum some tube, 2 x plumbers blocks , 2 x short lengths round bar to suit plumbers blocks , a piece of flat bar a bit longer than the circumference of the drum. you need to drill 12 off 10mm holes 1" above the flange and 6off 3" above the flange