I crack open all my ITG cards that are in my PC. I like all my cards to be in the one-touches. I keep the certs in the one touch with the card.
I use a flathead and a hammer. I go around the top of the slab and crack away the overlap. Then I slide the flathead between the two sides and twist the screwdriver to pry open the slab. Have cracked around 15 cards out and have never done any damage.
EDIT: I completely reversed the aboved-noted practice when I got hooked on UM9. Now I keep all my UM cards in their slabs and I take extra precaution to ensure the slabs stay clean and free from scratches by using graded card sleeves..
