Originally Posted by Junkster
I could only find a few pics - I sold that rig last year. As I recall, we made a hole in the bottom of the keg just large enough for the tube to pass through and fuse-welded it to the bottom with a TIG machine. You can barely see the underside in one of the pics. I made a restrictor from a SS washer to sit on top of the flue to keep the flames from shooting out of the top. The lid has a flap that slides open to let the gasses out & to help keep the heat in when the burner is off. I hope this helps.....
Junk, that's great! I've been recommending this for years, but I've never seen it actually done. I have an electric rig so not me.
BTW, did you ever assess whether the channel in the middle made a significant difference?