I have had a Featherweight for several years. The BEST book that I have found tells you everything about the machine and tells you how to take it all apart and take care and replace any part that might be needed. The book is "The Featherweight 221 and I" by David McCallum. The book was published in 2004. At that time this was his website: www.featherweight221.com.
You will love your baby ! Sue