Newbee--I just removed a customer quilt from the long arm and went out and bought new backing cause that wide back she brought was just NOT going to be straightened! Even just sewing the top seam to attach to bat/backing created a tuck! I had already straightened and cut and straightened for about an hour yesterday and again today and while on the way into the city for appt. decided to heck with it--I was not going to battle this quilt the entire top when I know the problem is the backing. So I'll hang onto the backing for something smaller that I can get it straightened.