I bought the Prep-Tool by GuideLines 4 Quilting to get a PERFECT scant 1/4" seam. It is inexpensive and you can reuse it forever. You can also buy the Seam Guides to go along with the Prep-Tool. The Prep-Tool is like a plastic ruler that you align your needle to. Then you place the Seam Guide along the outer edge (or whatever you use for a guide) and you have a perfect SCANT 1/4" seam. I've been using this for about 3 years and love it. I buy a couple of packages of the seam guides and layer them two deep. I never lose points anymore and it is a perfect scant 1/4" seam every time. I don't know how to put the site up here, but if you google it, it'll pop right up. Give it a try. It has saved me. I tried every trick before I found this and nothing compares.