Reima: I just drilled two holes at the both ends, diameter about 30mm. About 200mm from each other. Then I used the metal saw blade to saw the upper portion from one hole to the other and then the lower. Finished with sand paper and put some cut plastic tube around ( from broken screen ). I did not even remove the shield from the bike. Took some half an hour to do. How it feels? I get some more air through the hole. A bit quieter. Nearly all of the turbulence at back of my neck dissapeared. by: Reima Järvinen GTR1000/A15