I've wanted a high G whistle for a while and picked a Susato up on a half off sale.

Anybody got any guidance on what you have to do to get the second octave on this puppy going without your ears popping? I'm a reasonably accomplished flutist and play a moderate tin whistle...I've even managed to play the fife without pain...but the second octave on this little guy is turning out to be a real challenge. Anybody with more experience with a high G got any guidance?

Best

AA