Dazzaz,
As an elevator is such a simple shape to make I would just make another one, you get to choose the wood before you buy it so you can ensure it is a straight piece.

The drill a hole and insert small nails method is good for ballance, you can set them on the wing to get an idea of weight before you start drilling and glueing.

These small attention to detail items do really help improve flight performance. As stated above, it would still fly anyway, but while at this point why not make it fly better?

I have flown an indoor foam electric plane with almost half the tail missing, one third of the rudder missing, and considerable parts of the main wing missing. It still flew, not pretty, but it flew.

Enjoy the model.