I'm kind of a klutz with destructive tools. I've only tried once to crack a slab - it was a 1954 Bowman star card about a decade ago that I purchased because I could not find a satisfactory unslabbed version for my entirely unslabbed set. If I recall correctly, I took a large wire cutter to the corner of the slab and squeezed as hard as I could, the slab cracked into about three pieces, one of which dug into the card surface and immediately cut its value by about, I don't know, eighty - ninety percent. That was the end of my cracking career, but I enjoy reading about others' experience with it.
Al - what the heck is an "irrigation screwdriver?" Never heard of such a thing.
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