Very simple... even with a pre-built wing (as long as it hasn't ben joined at center yet)

Re-cut the dihedral braces with 25% as much dihedral. (don't go flat... it looks like the wings are drooping... a little dihedral looks flat) High school geometry will tell you how to bisect the dihedral angle... (that's 1/2... again is 1/4) Note that if your plane calls for sandwiched aluminum bracing, you have to cut new aluminum plates... as well as the ply plate(s) Use HARD aircraft grade ply from the hobby shop, or Hobby Lobby carries it (even if the stock ply wasn't as hard a material...).

When putting the root ribs in place (asssembling your own) put them in at 1/4 the indicated angle (or don't glue them and don't sheet the top center until the wings are joined... it works. [img]i/expressions/face-icon-small-wink.gif[/img] )

If doing it to an ARF wing... you have to cut a wedge of hard balsa to fit between the wing panels, and you have to use fiberglass tape reinforcement of the dihedral jont EVEN IF the wing is suposed to be bolt-together and dissasembleable. (There's a couple of these out there. The wing wil be permanently assembled.)