I'm looking for suggestions to solve a problem with split flap construction on a Midwest AT 6, which is an all wood kit.

The wing surface above the split flaps has curved upward because the top sheeting, 3/32 balsa, shrunk. This has moved the trailing edge about 1/16 inch out of position. The good news is the trailing edge remained straight; It did not raise just between the ribs.

I believe I can restore the area to its original shape by wetting the sheeting and clamping a straight edge (pine board), but the problem with reoccur as the balsa sheeting again dries out.

The rib ends in the area are about 1/4 inch deep at the front of the split flap and taper to nothing at the trailing edge. They are not strong enough to overcome the pull of the shrinking sheeting.

I suppose one fix would be to cut off the existing rib and sheeting and replace it with solid balsa with the proper cross section. Short of that, I wonder if any of these might work:

1. Moisten the sheeting, realign it, and glue carbon fiber strip to the underside of the sheeting.

2. Moisten and realign, and epoxy medium weight fiberglass cloth to the underside.

3. Cut the top sheeting and, if necessary part of the ribs beneath, to allow realignment of the surface, and fill the cut with epoxy with micro balloons.

I would appreciate comments and suggestions. Thanks!