Have you tried visually identifying the geometries, like a visual trace? If
you're trying to spin wheel 3, are you sure its wheel 3 you are referring
too? For this kind of stuff I usually do:

var traceMat:WireColorMaterial = new WireColorMaterial(0xFF0000);
for each(var face:Face in theMeshIThinkIsTheWheel.faces)
{
     face.material = traceMat;
}

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