I had the 6500 and now have the 7700. To get a scant 1/4" seam, I take a lined 3x5 note card. The lines are 1/4" apart. I put the flange of the quilting foot on the line so the left side of the flange is on the left side of a line. Then I move the needle to the right until it is just on the right side of the line immediately to the left of the one the flange is resting on. Once this is set, then I sew the 3-strip test using scraps of the same fabric that I will be using. If it is off, I make adjustments. When it is adjusted the way I need it, I push the needle through the 3x5 card and mark the line that I had the flange on. Doing this, I can move between machines and still get the same seam.