The clamp has been beveled to accept the planking. Notice the color change half way through the clamp. This boat is designed with two clamps, one on top of the other. The idea was you wouldn't have to bend in such a heavy thick pice of wood all at once. The main clamp would go in and then the boat would be planked. Once the boat was flipped over, then the upper clamp would be glued down on top of the main clamp. Michael decided he wanted to put it in while the boat was upside down instead.

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