To replace a board that has been previously installed with Shadowdeck Hidden-Deck Fasteners, use a reciprocating saw to cut all the Shadowdeck fasteners along the side of the board that is farthest from your house or building. Now carefully pry out the board, working from the side on which you cut the fasteners. Use a standard biscuit cutter to cut slots (kerfs) at each joist on the side of your new deck board closest to your house or building. Now install the new board, sliding the slots over the existing exposed Shadowdeck Fasteners. Fasten the opposite side of the new board using screws and plugs at each joist. Use the correct size drill bit and countersink and drive in the provided screw.