I've always thought I was getting quarter inch seams using my quarter inch foot. Even measuring the seam it looks like 1/4 inch. Started the Skill Builder BOM at the beginning of the year and my first block didn't come out right. I got one of those plastic thingies with the tape that you tape down to have 1/4 inch seam...my presser foot wouldn't go down with it on my machine. So then I read about measuring 1/4 using the lines on an index card. I did that yesterday and decided to put painter's tape where 1/4 line is. It covers one of the feed dogs! What's up with that?!?!?! I have the Pfaff Ambition 1.5. Why would the machine be designed this way? Does anyone have any thoughts on this?