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Julie(where the label is) right between the two halves, and when you get 1/4th or 1/8" in, turn the knife sideways, and you will be greeted by a gratifying "crrackk!"
GAI and Beckett are much harder because of the "nesting" factor. Check "search posts,"--someone found a machine that does it for you. I just take a needle-nose plyers and
attach it all the way around, about 1/4 inch in, and crack the plastic off. It does tend to fly accross the room....