I have the 1/4" foot with the guide blade for both my Bernina and my Janome. What a difference these feet made over using the 1/4" foot without the blade. For my Bernina, it's right on the nose for a scant 1/4", for the Janome the needle must be moved a touch to the right. You just have to know your machine and make use of the tools out there!! Before I got these feet I tried many methods for keeping a uniform 1/4" seam, but these work the best.