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Thanks, nice explanation, though it definitely relies on digging a little bit into the material : "When the bolt is tightened, the teeth grip and seat the mating surfaces".
@Chaley and yourself convinced me, I'm gonna try them out before drilling through my frame. Do the copies work just as well? The nord locks are stupidly expensive.
here you are
https://www.nord-lock.com/shop/everyday-applications/how-it-works/