Hi my very intelligent and most helpful friends!! I need help again. My backing material is too narrow (by about 6 inches) for my quilt top :( I have extra material, so I'm not worried about that. I want to match up the print so it is as unobtrusive as possible. I plan on adding this extra material to only one side. I'd pressed a half inch seam (on this extra) and have matched the pattern PERFECTLY. Now......how do I secure this extra material to the backing, so that it doesn't move and I can sew it??????