Claire thanks for the link showing the backstitch done on a knitted piece. The pattern calls for the backstitch because we want the seam allowance to show at both the front and the back center seams. What I'd love to know is how to ensure that you are going in a straight line. I tend to wobble off just a bit here and there as I seam and wouldn't ordinarily want anyone seeing the seam job I've done. This time I've no choice so want to do a very good job at this. Thanks for all the suggestions.