Guitar Hero II cardboard fret mod - Xbox 360 Fanboy

Over at GrownUpGamers.com they've posted a helpful tutorial to fix those unreliable Guitar Hero II fret buttons on your X-plorer guitar. Their tutorial is for those of you who experience not so responsive fret buttons when rocking out to your favorite jam. This unresponsive fret button problem occurs when the fret buttons don't fully press down on the contact due to some shifting action. And all you need to fix those buttons is some confidence to open up your guitar, some cardboard, scissors, and tape. And voila! Fret buttons fixed. We're just wondering what type of cardboard would work best. Gushers, Pop-Tarts, Fruit By the Foot, or Cheerios ... oh the choices.