I've had some good success with the following, SATURATE the wing with a 80/20 mix of water and alcohol {I use the bath tub and hold it under for about 5 min}, rubber band the wing to a sheet of plywood bent in the opposite direction just a LITTLE past straight. Use finishing nails to hold the rubber bands and balsa blocks on the spar and sheeting to prevent damage to the now soft wood. After 24 hours saturate it again without removing the rubber bands and let it dry completely. It seems the alcohol helps the wood soak up the water and also speeds the evaporation. The mix does not seem to have any effect on most glues except white carpenter types. This was taught to me by my uncle, he used to make, believe it or not, coo-coo clocks. :^)