I was trimming the batting for "foldover of backing binding," by inserting small cutting mat between backing and batting, lining up ruler with top and slicing off with rotary cutter, moving mat, etc. I was interrupted and -- you know where I'm going, don't you? I forgot to place mat BETWEEN backing and batting and sliced a good long hunk of backing even with batting. Second photo is of only fabric left from this project, made from bits I've had for years. Any ideas?