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Just avoid the credit card sharpeners from DMT...The backing is very thin and it bends easily...making th enickel plating crack...moreso th enickel plating is very thin and they ware off incredibly...

Either get an Ez lap 26F diamond stone and ware it out a bit before using it for slurry.
Either stick to making slurry from a softer coticule slurry stone.

I often runninto this problem with hard...