Review on Upgrade Your Welding Tool: BLUEFIRE Solid Brass Jumbo Pencil Flame Gas Welding Torch Head, MAPP & MAP Pro Compatible, Full Metal Version by Brian Krump

Workmanship and assembly appear excellent (hence the two stars) but 'extremely' difficult to light and keep burning as the flow rate may not be properly adjusted. It will only light up when the gas valve is set to just open at a very specific setting, or it will just always go off. I've tried it with both new and partially used Bernzomatic MAP Pro and propane fuel tanks. Also, a high quality valve was placed between the tank and burner head to adjust it, but the results are the same. If you can ever get it to burn and heat up the burner head, it can be adjusted a little, but if you fiddle with it, it goes out easily. I don't have this problem with my other burners (Bernzomatic, Steinbrucke, etc.). I'll go back and get another pencil flame head.