The point here is this was a beginner question who may not have the knowledge to have, build, or use any type of cradle and pendulum. At best he may have something like the Great Planes C/G Machine, which does instruct the user to balance low wing planes inverted.

I was simply responding to a thread in the beginners section with a beginner in mind. I find sometimes we get carried away in some of these posts especially in the beginner section.