You can bring "sharp edges" in. I have a credit-card-sized toolkit that includes a knife that is maybe an inch long and I got it in hand luggage multiple times. The regulations specify a minimum blade length.
And he mentioned washers for stamping words on them, not a big metal plate.
Not all airport security is the same, it might also be the guy's first day on the job.
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All the more reason to push back. Security standards should be the same, otherwise what sort of security is it?
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