I lit up one of those weed killer torches and a light went off in my head...
So I had an old fire extinguisher which has been replaced. This thing is probably close to 20 years old and never been used or recharged.
Started by cutting off the top.
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Then I had to cut a hole. This was the biggest question in my head. Only hole saws I could find were for wood or softer materials. I figured I would sacrifice the saw cutting through the steel but was too cheap to spend $14-$18bucks on a saw to use one time. So I roughed it in with the angle grinder.
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I smoothed it out with a rotary file chucked in my drill press.
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I had a 2 3/8" jewelry casting flask that the propane burner would just fit into. I fitted it in the hole opened up very tightly. I mean VERY tightly. It takes a hammer to tap it in and out.
Then I tapped it for thumb screws.
I put the koa wool in and went out to do a test firing.
Continued...