In hindsitght........... and a tip to anyone else silly enough to try this!
To prevent a floppy flat rod.
I would have drilled thru the wing for the flat rods, at one end.
Glue in the rod at the Other end first and let that end set.
Then with the rod TOOOO long, pull it thru the hole keeping a small bit of tension and glue in place.
Cut off the excess rod, fill and smooth the hole to finish.
Shoould end up with a nice taught, straight rod.
Dam, why didn't I think of this sooner.