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The dovetail joints on the donut appear only on the outside. Robert suggests that the joint is curved around one side of the donut. The photograph shows how this is really accomplished. The locks are another matter. The only clues are small holes in the side of the bottom piece and one on the top of the "icing". Blowing into the hole in the side lifts the primary locking pin allowing the top to slide. A secondary pin keeps you from simply turning the donut upside-down. As the top slides off, the primary pin drops into a catch hole. A very ingenious puzzle.
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