When I built a forge I had to try several jet sizes to get it right. When I went too far and drilled too large a hole I would solder the hole shut and redrill it smaller,, worked fine. however after useing the forge for long periods then turning it off the solder would melt out. When the forge is running and gas is flowing it worked I think the gas kept the solder cool enough to stay intact. I believe you could braze that and it would work. Or plug like suggested above.
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