I am going to suggest the following: Singer Featherweight 221 Book - Third Edition by Nancy Johnson-Srebro.
When my mother gave me her Featherweight two years ago (I learned how to sew on it when I was a child) I was thrilled. The best purchase I made was Nancy's book. What I find to be so incredible about the Featherweight is the perfect, beautiful lock stitch it makes. The drawback to the lovely lock stitch is that the finely tooled mechanics of the Featherweight can give you problems from time to time. Her book is the "bible", and I refer to it whenever I have a problem with Ethel (my fond name for my 221).
Here is a link:
http://www.henscratchquilting.com/sife221bothe.html
It is the best $21.99 I have ever spent.
Kanoelani