Extract exhaust bolt: weld nut or drill?

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Originally Posted by Boogle

Thanks for the advice - makes sense. Will try to follow it!

You ever sort this? I had 6 of 12 broken on a new to me engine. I tried welding, but the bolt just kept snapping below the welded nut, and had to buy the pricey jig to drill it out. I think the welding effectively heat treated it. Tungsten carbide bits were the key.