I got a 1/4 inch foot with guide and my accuracy has improved so much. And I am an experienced sewer and didn't think I needed it. On another machine, I don't have a presser foot with guide and the needle is not in the center of the 1/4 " presser foot. I adjust the needle position so that when I use the right side of the presser foot as my visual guide, the needle is in a position so I get a perfect 1/4". Hope this makes sense to you.