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For what it is worth I agree with Charlie, I have seen an awful lot of electronics over the years and can't remember anyone going to the effort of bending legs.
The devices are designed to be through hole mounted after all. I think vibration would be a bigger worry than expansion. It is probably not to hard to work out how far copper will expand with a temperature change, I am guessing it is a known factor. If it turns out to be 5 microns I can't see it being an issue.
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