May 20, 2019 · Temporarily modify your jig by screwing a 3/4-in. strip of wood to the jig’s fence (Photo 2), positioning the edge of the guide on the cutting line (like you would for a square cut), then make your 45-degree cut. Drill 1/8-in. holes about 3/8 in. away from the edges of the sides (A), spaced about 4 in. apart.