"The CG would be at the intersection of the two lines indicated by the plumb bob."

In reality, when this thread says CG, they really mean center of balance, and are only concerned with the horizontal plane.

"I have found that even though you can balance mid-wings and low wings right side up I find it easier to do them upside down."

With the Vanessa, it really makes no difference, since the plane is supported above the mass.

"I wouldnt worry too much about using a level, as many planes that would be balanced on a Vanessa rig doesnt even have a level or flat enough surface to put one on in the first place. "

I try to find a horizontal place on the wall, like a joint of wood, a window sill, or the street surface down the way, etc, and align the horizontal stab with that.

Les