I found that by moving my needle one place to the right and then using the edge of my regular presser foot as a guide, I get 1/4" seams. I based this on putting a piece of 1/4" graph paper under the foot, lining the needle up with a line and adjusting the needle to the right until it came down exactly on the next 1/4" line. Haven't had a problem since. If this works for you, you might write down how far you moved the needle so it will be the same every time. Just a suggestion ... :-)