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This is where I brought all my nanis from
Sharpening Supplies - Sharpen Your Knives and Tools With The Right Supplies

For the DMT check carbatec. The Naniwa 12k is higher grit than most slates, the mst or the cheaper thuris(you will only get a very small decent one for the same cost as the 12k maybe 5x1 vs 8x3 for...

Congrats on the sucess. A 1k and dmt will make it quicker and easier though. But as said these things breed like rabits.