When I recently made the Outdoor Bar/Server from issue 184 of WOOD® magazine (July 2008), I ran into trouble spacing out the two dozen slats that make up the top. A tiny error in the width of my spacers, multiplied by each piece, threw the layout way off. Because the margin of error was so small, it made it hard to measure precisely, so I turned the power of multiplication back against the problem. Aligning six of the spacers together edge-to-edge made the error easy to measure with my calipers. Then I just divided the accumulated error by 6, resized the spacers to compensate, and the slats fit perfectly.—Erv Roberts, Des Moines, Iowa