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Just my 2¢ .... I think the muffle is to big in diameter thus restricting the amount of air movement and creating back pressure on the flame/nozzle.

The heat treating forge was copied from one that Howard Clark built at one of his workshops on metalurgy.
His was a 30 gallon water tank.
Yes, the idea is to have enough volume in the tank to make...

For a burner lookup ron reil and read his info.
The basics are a pipe with and end cap.
Drill a wire gauge 60 hole into the end cap. 3/4" pipe will be fine. This will be your burner.
You will take...