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There are many different ways a combination lock can be built, the two most common are the "dial" and the "disk" construction. In both types rotating "tumblers" must become aligned so that an unblocked slot through the stack of tumblers allows the "bolt" to slide and unlock the mechanism.

  • "dial" combination locks have a single rotating dial with a scale on its outside edge, this dial is rotated in alternating directions to enter the combination, if any error is made the entire combination must be reentered from the beginning, the "tumblers" in this type of combination lock are hidden inside and they are temporarily connected by pins on opposite sides to allow the rotations of the dial to turn them into position to align their slots
  • "disk" combination locks have several separate disks with numbers or letters marked on them, each disk is individually turned to enter the combination, if an error is made only the incorrect disks must turned, the "tumblers" in this type of combination lock are the inside part of each disk allowing them to be independently turned into position to align their slots
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Q: How does a 3 digit combination lock work?
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