Here is the picture of my wing showing the spar/wing tube and the shear web.

Also a little tip that can be taken with the grain of salt that it is served with:

The second picture is an attempt to show the little numbers that are molded into the ball links supplied in this kit.
When mounting these ball links the numbers should go toward the servo horn you are mounting them to. In this manner if the link should wear out and fail some day it will not completely fall apart thus allowing you at least some control with that linkage.