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/ (9); // generally-useful spacing amount for vertical columns of stuff right_rib_thickness = 2; // Website specifies a thickness of the rail + a safety margin // margins from edges v_margin = hole_dist_top*2 + thickness; v_margin = hole_dist_top*2; left_rib_x = thickness + 6 + tolerance; rotate_vector_cos = 0.94; // 'x' of 20 degree rotation rotate_vector_sin = 0.34; // 'y' of rotation left_edge = -rotate_vector_sin * rail_depth; right_edge = height - v_margin .

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