That looks very similar to Steve Lindsey's sharpening system... As for the diamond stones, I've tried using the cheaper ones and found that they weren't terribly flat, and that small tools (like gravers) tend to catch in the cutouts - so went for some diamond credit cards instead. How are you getting around those? I'm not sure I'd suggest carbide to anyone starting out - they're not the most friendly of things to sharpen (well, unless you've got a power hone...
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Don't know if you've seen, but that EBay seller also does HSS 3/32 squares that are spot on for both the GRS systems & the Airgraver.
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