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The rods are to reinforce the wing structure, and also to align the wing parts.
The elevons need a 2mm carbon tube, 320mm long.

The servo horn and the elevon horn are attached by a pushrod. There are several ways of servo pushrods. One of them you can see on a picture of the "Speedy Red Mini Wing" http://www.thingiverse.com/thing:1117576

Speedy "Red Mini Wing" RC Plane
by wersy