If you have two seized adapters, you can heat them up a little in the oven for a few minutes, and then put them in the freezer for a minute or two with the inner threaded part touching the shelf. They will unbind when the inner thread shrinks a little. I have had to do this a few times.
Also when the telescope mirror making tool binds to the mirror. Or to get pitch off the tool, the freezer works.
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