I got a copy of the factory "instruction book" (user's guide) and a copy of the factory repair manual for my S470D from Valley Power (satohparts.com). They are local for me and a valuable resource, so I support them. They are good quality copies, spiral bound so they lay flat. Very helpful. Some of the language translations are kinda funny. I think some of the other vendors who post here also offer copies of the factory manuals as well.