Put water into a spritz bottle and dampen the quilt. Use T-pins and pin the edges of the quilt onto a clean sheet. Pin the sheet onto clean carpet, then spread out your quilt onto the top of the sheet. Push the T-pins through your quilt, the sheet and into the carpet. Gently, gently stretch your quilt back into shape. The moisture in the fabric will allow the fibers in the quilt to give; then when it dried, it should stay in the deminsions that you'd pinned it. Don't forget to measure as you pin. You do want the measurements to be the same for both ends of our quilt for the length. Measure the width also to make sure it is the same throughout your quilt. This has worked for several in my guild. Let us all know how it comes out.