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Use scrap pieces of wood as fences on all four sides of the work piece. Screw the scraps into place on the panel-saw table. Set the plunge router to the desired depth of the grooves to be cut into the work piece. Mount the router on the T-square.
Use a pencil to trace the lines where the grooves will be on the work piece. Tighten the four stops on the T-square's rails at the ends of the four pencil lines.
Set the gauge on the T-square to correspond with the center of the router. Tighten the gauge in place at that point.