
I sent it for export, loaded it into Maya 2009, exported it to Maya 6.0, and in 6.0 I created a Joint Tool named Global according to the tutorials, then a Global group, and tried to load everything into the editor. The result is the same (the artifact doesn't rotate). The internals of the .xdb say that Global is considered the bone.
How does it work then for finished models that have their own skeleton of bones? They aren't created from scratch in Maya 6.0, they are just re-exported (even in the Estonian's video it's like that; he just ran a randomly downloaded model through two Maya programs to get the required .mb file).