I have found that the 1/4" foot for most machines is not a true 1/4". I went and bought the seam finder that Bonnie Hunter sells on her website (
http://quiltville.com/shop.html#!/Se...egory=13129325). It works really well. You place your needle in the appropriate hole for the seam you want and mark your machine with tape or whatever you want.
I now get much more accurate seams than I did with any of my 1/4" feet (Janome or FW).