Since Carbon Felt is expensive and difficult to find in my “corner of whe world” I make one using an Coke can for the esternal part (fuel depot), and deodorante bottle for internal part (pot support) and steel wool (for cleaning cooking pots) as wick material, work well and surprisingly the steel wool create a “varnish” in the flame area and last longer. Probale the “varnish” came from some additve of the automotive Ethanol sold there.