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Several years ago, screeners confiscated a tiny wrench that was on my keychain, which I used to tune my drum head. It was about 3 inches long -- about the most inoffensive item you could imagine.
'No tools.'
'Come on, it isn't a hammer, it's just a tiny wrench. It's a KEY CHAIN for christsakes.'
'No tools.'
'What possible neferious use could I put this to? Am I going to disassemble the plane in midair with one 1/2" wrench?'
Suspicious look.
'No tools.'