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Glen, I agree with you for the most part, the 8k+ grits will not reasonably bring a dull edge back to shaving sharp. But there is a decidedly noticeable difference in sharpness between 4k and 30k, on...

8k was never all that comfortable for me, 12k is good, CrO is better and cheaper but not necessary.

2 to 3 passes is the commonly accepted number of passes necessary to get a good shave.
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