Well I would make sure it was the 4 inch size they wanted or bigger. Many of the suggestions are good. I would add a 2 inch strip along the bottom edge after removing it from the back of the quilt. You could sew by hand or machine. Then reattach it to the quilt by hand. For future hanging sleeves cut the sleeve 10 inches it will finish at the size you need. Unless they want a 5 inch sleeve then I would cut it 11 or 12 inches. Good luck Luann