I can understand your confusion. I did too and played with my sewing machine, I own a Babylock Ellure. I had to use a regular foot, not a quilting foot and adjust the width (needle from left to right) to 7.00 mm. Bear in mind that every sewing machine's measure aren't the same but as accurate. I found that its in btwn 1/8th and 1/4 inch if that makes any sense. My suggestion? Play with your machine, create a block that will measure 12 1/2 inch (www.quilterscache.com has many! and an easy one :) ) and work with it. Once I got it I had perfect squares. Not all patterns for blocks will ask for a "scant 1/4" but its safe to say when it does at least you know the width for it. If I'm wrong here any one can stop me! lol! :-P :-P