I found this at a flea market. A piece of smooth flat metal, about eight inches tall and an inch wide with a slot of about a quarter inch down the entire length. On the upper left corner there is a blade very similar to the blade of an exacto knife pointing down. At the very bottom there is a round piece of metal like a heavy coin with the Singer logo. It looks like it is meant to be a handle.
I have several books by Singer on machine attachments and two machine manuals and see nothing like this. Maybe it's not meant to be used with a sewing machine and is just a clever gadget.
It might be just what I've always needed....if I can only find out what it is.
Help!!