My son and I purchased a Stevens 59A to refurbish as a little father son project. How do I get my hands on a manual?
the manual won't help you much. That would describe cleaning and shooting the gun, not repairing it.
You can find an exploded view of all the parts at http://www.gunpartscorp.com/SchematicDisplay.aspx? schem=/images/schematics/Savage_39A_schem.jpg&name=59A+(*)
that's probably all the help you're going to get.