It's probably easier to keep track if you post up on your build thread but just to add I would thoroughly rough up the rudder stock where it's embedded in the rudder blade. I'd mask off the length in the rudder tube as you don't want to scuff that, then attack with jewelers files / junior hacksaw blade / rough sandpaper, then clean the roughened shaft with some form of solvent (not paint thinner). It helps the epoxy to grip hard. Put some epoxy down the hole as well as on the shaft. Don't take the masking tape off until the two are pushed in, then carefully clean any epoxy that remains off the exposed shaft. If you're careful, you can wait until the epoxy has greened (started to set) then scrape any residue off while it's "rubbery". I'd also agree with Umi, if you can measure and drill accurate enough, a pin through as belt and braces and the exposed ends very carefully filed then sanded back after. Better a belt and braces once, than repairing later.
Rich
PS, is that rudder stock slightly bent or is it just the lens. Might be easier to straighten it before you assemble.