If you go to
http://groups.yahoo.com/group/vintagesingers/
they have a lot of information on Featherweights and other vintage Singers.
I missed the 1916 Singer treadle FOR FREE by one phone call. I am so disappointed as I love the old machines. They have a perfect straight stitch and are great for piecing.
Can't wait to hear about the class. Even if you didn't have a Featherweight, you would learn a lot.