Butt the mating ends of the fly rail and the long outer side rail piece together, making sure the board edges are aligned. Use reference letters to label the pieces, then mark a shoulder line on each board about 1 inch from their mating ends; use a try square to ensure the lines are perpendicular to the board edges. To complete the joint outline, use a tape measure to divide the boards into five equal segments across their width, creating a grid of fingers and notches on the board ends. Mark the waste sections—or notches—with Xs (right) so the fly rail will have three notches and the mating piece two notches.
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