RE: How to repair wing dowel loose
Here is a thought. Remove the dowel andsee if you are able to lighely clamp the peices so they can fit back together. If so, get Elmer's glue into all the cracked, damaged areas, and reset the dowel in Elmer's and reclamp just tightly enough that all the peices fit back together. Let it set overnight and go fly.
Hope that is hlepful.