[boxed]

Airport security is trying to find bombs and knives. Those are potentially orders of magnitudes bigger than the cheating devices we're talking about here.

Airport security won't find my 0.1mm knife, and it's not a problem if they don't.

[xxs]

Instead just buy a few bottles of vodka at the transit area: you have flammable liquid and properly sharp/hard object, way better than knife.

In short I'd not bring airport security in this topic