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stefani use a hammer or any heavy / blunt object, hold the card on a sturdy and flat surface keep a 1/4 inch of end of slab off the edge of the surface. place pressure with your non-swinging hand on the slab and hit it with whatever object you've chosen and wham bam you pry the slab and you got your card.
if this doesn't work use a blow torch.
Ps. Pro holders are the toughest objects known to man kind. I once knew a man who cut a diamond with one!