I hate to break it to you, but if those threads rust, the oxide takes
up more space over time as rust accumulates and creates a strong
interference fit of sorts. Lubrication won't really help other than
how much it stops corrosion.
You didn't say how much heat is involved, so there's no way to know if
any chemicals might drip out, burn off, oxidize, gum up, or make
More information would help. Could something disposable by way of
wire cutters (for example) be used instead? .
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