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In page Boot (torture):

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A version of the boot from Venice, sometimes called the foot screw or toe breaker, connected the crank mechanism to a drill that slowly mutilated the foot by boring a hole through the center of the instep as the press was tightened. Further, a spike might be positioned over the big toe, which punctured the nail and savagely tortured the sensitive nail bed as the press was tightened. The "toe breaker" from Nuremberg was a wider instrument that accommodated both feet, side by side, simultaneously applying inexorable crushing pressure to all ten toes. Were the prisoner particularly stubborn or strong-willed, the press could be tightened until the plates met, so grinding the foot bones to powder.[citation needed]