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Preparing the stock for the pigeonhole dividers isn't as easy as it looks. The stock needs to be milled to a 3/16" thickness, but in making it that thin it's way more likely to crack or split. The solution: support the wood as it runs through the planer. Tommy does this with a piece of MFD clamped down to the planer which provides the support the stock needs to stay in one piece as it passes through. Once Tommy has the stock milled to the correct thickness and the sides of the cabinet routed at the precise height, the dividers slide in "like butter."