It's made by Ryobi Bob. The 315. in the model number is what tells you that. On our home page is a manuals section. Click on the Craftsman Manuals section and see if it is in there. You can also try Sears or Parts Direct. Or you can try Ryobi's website and see if you can locate it there but the numbers likely won't match.
Someone I consider a master woodworker once told me that a master woodworker is not someone who never makes mistakes. He is someone who is able to cover them up so that no one can tell.