• Fill the head of the bolt with superglue, it can either be chipped out or removed with acetone. If it cant be simply removed I doubt they'll persevere. Alternatively... fill the heads with Sugru is difficult to remove, but comes out in one piece, and you can re use it.

  • Would it also be possible (but maybe completely stupid - just a thought) to fill the screw head with tin? I mean with a cheap soldering iron and some tin (like for circuit bord soldering for example) it should allow to fill the screw head preventing or at least deterring thieves while allowing to remove it easily if needed by re-heating it?

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