I was looking a featherweight machine to purchase, but I don't know much about them. I found one for sale (1947 221 featherweight) and the woman said when she had the machine checked a few years ago to replace the belt and the Service man said it works but moves slow. The seller didn't know what it meant and I don't know if that means there is something wrong with the featherweight. Any thoughts? And any advice on what to look for when buying a featherweight?