How to remove broken Frankenstein stud?

[greenMachine]

Which is why a fallback is good to have.

Oh, anyone need an Ezyout, one careful owner, never been out of the packaging, priced to sell ...

[StillIC]

Having owned quite a number of various thread extraction devices, I have given up on them. They never quite work. Why? I am glad I asked!

Well, if a (steel) bolt/stud/thread is jammed up enough that normal techniques/tools can't remove it, which usually means the head/nut has broken off, what chance does an even smaller piece of steel jammed up the centre of the stuck thread have?

I know that the various removal tools are made from quite strong, hardened steel, but so are most bolts and threads that I have trouble with. The tools simply can't outmuscle the threads in torsion. And when one realises that the torsional strength of a round member (ooh err) is a cubic function of its cross sectional diameter, the point is reinforced.

Having said all of that, I can imagine a situation where thread extraction devices would work: when a thread is down a hole but not stuck, as such, and one simply can't reach it with any other tool except a left hand threaded removal device.