The best I can do for you is hook you up with Ryobi to order their Operator's manual. Listed below is a link that will take you to Ryobi's diagrams and parts for this model blower...you will find the Operator's Manual at the bottom of the list in Figure A...you can then order it from Ryobi.
You are going to have to tunnel through to get to it, I will walk you through: Click this link first-
http://www.ryobitools.com/support/parts_batteries
Then click on the tab that reads:
Then click on: Repair Parts Catalog, the HCPI, a new window will open, click on the I Agree tab, the catalog itself will open, enter your model number (RY08578), once your model comes up, click on Figure A, a new window will open showing a parts diagram and the list of parts underneath the diagram, scroll to the bottom of that list and you will see the Operator Manual listed, click on Add to cart and order...easy peasy.
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