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You can hit it with a chisel and deform it right at the threads if you want. Getting into the threads a little bit won't hurt, it'll clean up when you remove it next time. That's a common way to do it on different applications.
How did you tighten it last time? They might be torque to yield, which means they should be replaced. A big ass impact gun will usually yield it enough that it is fine, although not an official recommendation.
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