I just need a gentle "nudge"... no spoiler/walkthru please!

I have opened all of the tusks, the color combo, the "no bridge" one, and the cave one, as well as the main/lab one. What I can't seem to find is any type of clue that will help me w/ the ball settings on the devices inside the 3 outer tusks. Could someone nudge me in the right direction? I'm afraid to ride the elevator because of crazy dude at the top - not sure I have all the pieces yet to confront him. Or is that exactly what I need to do?

Thanks in advance!