You know when you want to extract a short, unbroken stud from a casting without damaging it, but it's stuck tight? Well I never found a good way. But I had an idea this afternoon. I took a hex nut, cut a radial slit through the nut, screwed it onto the stud, and squeezed it tight in a mole wrench. So it worked a bit like a collet. It turned the stud out easily. Here's a picture:
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No doubt someone else has had the same idea in the past, but I was pleased with it. Might help someone else. I'd be interested to hear how it works for other people.
Chris