I tapped the tiedown blocks for the tiedown rings:
|Tapping the right wing tiedown block|
|Cleaveland tiedown rings attached to the right wing|
And last, I enlarged the larger holes on the aileron bellcrank brackets (the white ones from the picture above) and deburred them.
That's it! Hard work :)
Total main wing spar time: 1.2h ('cause I'm efficient!)
Total main wing spar rivets: 0 (it's held together by quickbuild magic :D )