My mom has had a Singer FW since she got it for her graduation from college present from her parents in 1948. Her vision is not real good and the old manual has very small print and half of it is missing... A couple years ago for Christmas I printed out a manual for her. She just kept holding it and looking at it. Anyway here is a link.
http://www.singerco.com/accessories/instruction-manuals Just scroll down to where it says search. Put 221 in the box in front of search and then hit search! Then you will see a page with some options. You can buy a copy for $15 or you can print out a free copy. Way cool!