help: Ranna Caverns 13, alternative

So, I'm stuck here:

Anyone got any tips? I can't actually figure out a way across.  The save with easy mode is on my computer, and i'm on my laptop for a week, so I can't even remember what the ordinary solution is.  But, beautiful game.  Funny thing, at times i'm playing it i get really involved in the atmosphere etc, but at others I can't relate to the featureless ball, and it's just a pretty puzzle game.

Just had a look and got through it by jumping in, letting it rotate counterclockwise as far as it can, let it start to rotate back left, jump into the tunnel bit which is pointing straight up (in your screenshot), weigh it down so it rotates counterwise again and the other tunnel bit should let you fly off into the exit.

If all that makes sense.