To allow the tabletop to move, the rails are fastened to it with screws rather than glue. Mark six screw holes along the top edges of the rails—three on each side of the recesses—and bore them on your drill press. Holding the rail upright on the machine table, drill a counterbored hole through the workpiece at each mark; use curved backup boards to help you steady the rail. Then turn the rail over and enlarge the bottom of each hole (left), using a '/4-inch diameter bit. This will facilitate wood movement. Do not drill too deep, however; for proper anchoring, a screw requires at least 1 inch of wood with a hole no larger than its shank.
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