Smooth the case pieces and the backboard, using progressively finer sandpaper, finishing with 220-grit. Assemble the case in two steps, starting with the four panels and the divider. Spread glue on all the contacting surfaces of the pieces and clamp the joints securely, as shown in the color photo on page 116. Check the corners for square by measuring the distance between diagonally opposite corners of the case. The two measurements should be the same; if not, adjust the clamping pressure until they are. Once the glue has cured, remove the clamps, set the assembly face down on a work surface, and fit the backboard in position. It is secured with nails; do not use any glue, since the board must be free to move as the wood swells and contracts with humidity changes. Bore pilot holes for finishing nails through the backboard and into the rabbets along the back edges of the case panels. Space the holes about 4 inches apart, then drive the nails in place (right).
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