As Lugerdoc has pointed out, these tools are easy to break, especially if the adjustment screw is rusted in place or out of round.
I have had excellent luck by first soaking the screws with Gunk brand "Liquid Wrench - Super Penetrant" in order to free them up for easier movement.
Mauser720 - Ron
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Mauser720 - Ron
"Those who do not know history are doomed to repeat it."
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