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@790
Bike spike is ridiculous because it's external.
Forget security screws (simple torx btw) simple percussive application with a leverage tool or slicing throught the unit with a bolt cutter will render it useless. (tools any theif will have to hand)
Anything of this kind has to be internal with the risk of getting caught whilst trying to locate and remove it outweighing the benefit of trying. Seat post, BB shell, headtube/steerer etc.