Two excellent reference books are available: The Complete Woodwind Manual by Reg Thorpe and The Saxophone Manual by Stephen Howard. You do not have to be a member of NAPBIRT to purchase the book from their website. You might also consider joining. I have found NAPBIRT to be an invaluable source of support, training, and education since I became a member 18 years ago. Another good resource are the Repair Guides at MusicMedic.com.