Get out a piece of quarter inch graph paper, put a grid line right at the edge of your foot and lower the needle until it's just above the paper. Now move the needle to the right until it's a hair to the right of the next gridline. You can test by lowering the needle into the paper. That needle position is your scant quarter inch seam.
I don't use a #37 foot. I use a #20 foot with the needle one click to the right for a perfect scant quarter inch seam with the bonus of the open toe, full visibility of where I'm going, and the fabric fully on top of both feed dogs.
Last edited by ghostrider; 01-26-2013 at 06:30 PM.