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While the pyramid is usually associated with the Norton brand stones I have done them with Shaptons with some success. I have also experimented with doing something similar with different color...

I would start with treating it as an 8k and see how that works. You can always add more laps. As you know some cut faster then others. If you 'know' the stone's cutting speed proceed accordingly....

It would seem to me that the coticule combo should fill the gap between the 4k and 12k if it is of a good size like 6" long or better. The length making it easier to use IME. Then again a new...