Go to www.pambonodesigns.com and look at her product called Angler2. It's a sheet of plastic with sewing lines that you tape over the throat plate. Place your fabrics on the correct lines and sew your angles without using pins or drawing lines. I just used it on her pattern for trucks and rarely had to unpick seams. The pattern had 24 wheels, 13 pieces to each wheel and I didn't draw lines or pin any of the angles of the wheels.