Can you move your needle position so your 1/4 inch is actually one of the lines? If not, another good thing to use as a bumper is
moleskin, it's thicker so your fabric runs right along it. You can find it in the foot product aisle at any of the stores and it's what I used until I learned about and could afford a 1/4 in foot. I just cut a strip of it and put it where my 1/4 inch needed to be.