What I did to make sure my main & class machine were the same was to use the index card. My main Pfaff 7570 with the 1/4" guide foot makes a perfect 1/4" stitch. My class machine, Kenmore 385.1915 does not have a 1/4" foot. On the straight stitch foot it does have a 1/4" mark, but I have a hard time following it. I used the index card, moved the needle over to 6.0 so my fabric would line up on the right edge of the presser foot. Put a note on my machine, so I would remember. Now I can switch between machines for a consistant stitch. I also am now using serger thread in both machines. Serger thread is a little thinner than regular thread. I haven't measured any seams, but at least they are consistant! Works for me :thumbup: