Ok, I don't know if this thing can be made to work, but you get the idea? right?
There is a Circular CG calculator at Sporty's called the The WizWheel, but it
is $50, and we had hoped to sell our whole program in a few $50 increments using
economical combined printing an shipping techniques. Some more work is required
here.
Teetering Center of Gravity calculator with sliding weights. Since people find
the math too tedious and go out with wrong centers of gravity and die, This teetering
scale type with sliding wieghts could function as a mechanical calculator of center
of gravity.