I have an older Viking that will happily sew over that huge seam on jeans..with the help of one of those gizmos that evens out the thickness as you pass, going slow of course. But I also have a newer BL that is not stitching over an uneven thickness on the side of the pressure foot, not even under it. Took it in for checkup, still doing that, so it is going back and it better get adjusted, or whatever, or lookout Lizzie! I refuse to hear......my error, or not designed to do that!, or some other song and dance.....good money---- better perform!