RE: gaps between control surfaces
I might as well chime in. If you have been using nothing but CA on your hinges, then just choose a good location and reinstall using epoxy as others have already advised. Make sure and protect the pins from the glue. Montague uses vasaline, I prefer a toothpick dipped in 3-in-1 oil. Just light coating is needed. If your wing is in to bad of shape due to all the hinging and re-hinging attempts, why not try the Robart hinge points. They make small ones that would work great on a trainer. It's all I use anymore. Simply drill a hole corrosponding the pin size countersink a little and glue with either epoxy or what I use, polyeurathane glue (Gorrilla Glue). Key is to get both surfaces lined up well and drill the holes straight. Robart makes a drilling jig for about $5.50 that make it fool proof.
Good luck.
Greg