ORIGINAL: i3dm
extra 300, if you look at the wing tube you could see its actually 2 tubes one inside the other, its very visible.
on mine, just in case, i bought a full CF tube and epoxied it in, thuse making the wing tube as rigid as it gets !!
i3dm is quite correct it is a second tube... You can see it with the eye but it wouldn't photo well at all
Dennis