Another good book for FWs is by David McCallum. It is called The Featherweight 221 and I. He also has a DVD. It is all about knowing and maintaining your FW. It is SO thorough! He has a website at featherweight221.com He also has parts and accessories.
I think the book is awesome. I haven't watched the DVD yet, but I've only had my FW for about a month now. I was told I should give her a name... so I did. I named her "Jeanie", after my Mom, Jean, and because she helps make my wishes come true. :-D
Happy quilting!