Here is a great site if you love Singer Featherweights as we do. April 1930's is a site and shopped dedicated to Singer 221 and 221K models. They also have a great newsletter and wonderful information. Their current newsletter features a 100-year old brochure from Singer "Evolution of the Singer Needle" explaining how needles are made.
And, they have the coolest Singer 222 model. These have a thin arm so that you can sew in the tiniest places. I will have to sell a lot more on Etsy before I get one of these baby's. I am putting it on my Birthday, Christmas and all other holiday list!