[godelski]

The point is to have plausible deniability (just like the original simple sabotage manual). So they have to be realistic enough. Superglueing stuff down isn’t a plausible unless you’re on a boat. But requiring a signature with pen and paper is. Take it a step further and require blue ink (because “its distinguishable from a printed version” or choose a more obscure color for similar reasoning). But make sure to not tell them that until after the signature is received, so that they have to do it all over again.