Anyone have a parts manual for a CC QA36 or QA42 snow thrower? Would like the parts break down for the drive yoke attaching to the shaft with the chain sprocket. Set up says a 3/16" square key with set screw. My yoke has 2 set screws on it. Be nice to see what I am getting into before I go there. Lost the square key or sheared off something at that point. Yoke turns but don't turn the shaft.