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Fish hooks, engravers tools, needles. You did right to lap only one. You rarely need both sides.

I would not worry about gluing the arkie back to the box. Usualy they can sit in quite safely even without gluing. As about the slate I do not understand what you mean. Do you mean that you want to...

In that case +1 on slate. Would not be surprised that this one will be faster cutter than that arkie but with simmilar finish.

+1 on arkansas. Does the softer one makes slurry of same colour as the stone?