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The rocker box is made out of 12mm ply. The bottom is stiffened by having a second layer on the inside of the rocker sides, also effectively doubling the amount of gluing surface area here. The sides are stiffened by the full height board at the front but also by a semicircular piece at the rear. The circles in the sides reduce weight and act as hand holds for easy lifting. The rocker sits on a triangular ground board via Ebony Star and Teflon, with another shimmed piece of Teflon around the centre pivot bolt to further ease motions.
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