I have always found adding seam allowances to Burda WOF patterns rather tedious. The Olfa rotary cutter can be used with a little adjustable extension arm, but even though I really tightened the screw that holds it to the cutter I couldn't seem to keep it from moving and messing up my measurements. I discovered that if I visually lined up the black screw on the right hand side of the cutter with the pattern's seam line (I am right handed) that the blade would cut a 3/8" seam allowance. I then tried my Ergo rotary cutter and found that by sighting the clear projection on the right side along the seam line, I could cut a 5/8" seam allowance. Try experimenting with your cutters on some scraps and see if this works for you.