I have a babylock that is supposed to accept thick seams-using the foot with the little black button on the side---- sometimes it works, sometimes NOT! And if I'm doing piecing, I have to remove the piecing foot and fiddle with the 1/4" seam - my old Viking takes whatever I give it, no prob...and my long gone singer touch N sew would sew over a railroad tie if I asked it to. I really think these new machine are way too touchy......or maybe it's just the brand I have,,,,thinking of replacing.........