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Believe it or not, I use a hack saw if I ever need to remove a coin from a slab. I cut up toward the paper insert, on each side, until it actually get to the insert. Be sure you are cutting at the same place on each side. Then I care fully line the saw up with each cut and I cut the front and then the back so the cut lines up all the way around. Eventually I get the whole top off. Then I use a flathead screwdriver and gently pry each side until the seam splits on each side and I remove the front. Then the coin comes right out with the rubber insert, or whatever the grading service uses to hold the hold inside.
The use of any saw blade is so much smarter than anything that creates small fragments of platic all over the place. As I keep saying all it takes is one small fragment in the eye and that is the end of that process. Also, the end of an eye.
Thy not just throw a slab off a tall building? Melt the plastic off with a torch?