I bought the 1/4" foot with the small blade on the right side. I can put the edge of my fabric against it as the pieces go thru. I took it out after sewing and measured it, and amazingly it was just right. I don't know how I got good seams before this foot. On my featherweight, I used some "moleskin" . I cut a small 1/4" wide by about2" piece off and attached it to the bed of my machine. I was sure to measure the correct 1/4 " from the needle and it has worked for me for years.