Sew on your binding leaving a 12″ opening. You will need a 10″ tail of binding on each side.
Butt the flat edge of the tool up where you stopped sewing. Bring the binding over the top of the
tool and mark as indicated. Rotate 180 degrees and repeat with the binding on the other side.
Open binding lay the right sides up and cit from the marks you made. Place A tip on one mark and B corner on the other as indicted in diagram 3. Make sure to cut the straight edge as well as the 45″ angel
Sew ends together. Press seam open. This will work perfectly every time.