Removing a broke off thread

[Frank S]

A mechanic friend of mine dropped off a part that had the Dutchman thread of a horizontal boring bit broke off deep in the part
Asked me if I could get it out for him because he knew how tight those things get.
So I torched a couple holes in one end of my work table bolted and clamped the part down then proceeded to weld down inside until I had the weld built up high enough to weld a 1" nut to it. Once it had cooled I put a 1 /12" box end wrench on the nut and whacked the side of the wrench a couple times with a 10 lb sledge hammer, the Dutchman screwed right out.