That's a crack.
Tbh mate I'd leave it. It's the grade of steel and likely no preheat/slow cool.
And first chips facing some bar, 150mm stickout and no problem.
Well not today, yesterday. Dug my precious out (the tin of Kasenit, it is mostly the real thing) and set to with the big propane torch as the little one was definitely out of gas. Worth mentioning that the tongs you see in the pic were made for me by Glen a looong while back now, just after he was setting up I think and they are really really nice to use, I have a few pairs.
This is Glens website and yes, I know you are supposed to make your own as a "Blacksmith" and yes you can pick them up for peanuts (has anyone actually tried paying with peanuts?) but it's nice to support fellow tradesmen around the world: https://www.gstongs.com
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The little bottle benefitted from sitting in the fridge for half an hour first:
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Ah - thanks, but my Rothenberger gas torch cylinders seem to take a much larger thread than 1/4 bsp.