How did you get the insert width of 1 inch? I went to check mine and realized that it also is out of the packaging! If you think about it, though, these make double-fold bias tape. I would cut a one-inch strip of fabric and see how that works out; should be about right for ending up with a 5/8-inch wide strip. (Theoretically you could cut a strip up to 1-1/4 inches wide, but I think then you would risk overlap of the ends.) If one-inch is a little too small, I would try 1-1/8" wide strips.