Irving your burner does not need to be that elaborate. I have been running my furnace for just over a year now mainly to feed my habit of needing large blocks of ali to mill. I first went for an all singing converted torch head. these days i have a length of 6mm tube with a 0.6 welding tip soldered in the end which sits in front of a 20mm tube into the furnace. i can adjust the the tip in and out propped up by bricks etc etc. It's cheap, works wel, i do not need a blower and save a shed load of build time. I keep meaning to tidy it up but what the heck it works.