Please edit if I'm giving something away (sorry in advance, just thinking 'out loud' here), but also please help if appropriate and you can.
I have found that if I take a strong magnet to the bottom side of the ISIS, I can move one? or two? (not sure how many) ball bearings with the magnet, at least, I can move them about 1 centimeter before they lose contact with the magnet. Anyway, when I hold the ball(s) in place with the magnet and shake the ISIS, there is no sound whatsoever in either hemisphere. If my assumptions are correct that the 3rd ball bearing is indeed in the top hemisphere, does this mean I have not yet released the 3rd ball bearing? I have tried *clue 11* countless times with varying degrees of force and I'm afraid to do any more... Any ideas? Again, please edit if this question gives too much away.