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The 20 thousandths of an inch is stated on a sheet included inside the UF's box (also in the M and F's box). Was in my purchases, anyway.

My stone was within manufacturer's specs, barely. It still...

I lapped my UF. It can take a very long time if yours is near the 0.020 inch tolerance. Spyderco told me you will void your warranty if you lap the UF.

I lapped all three of my Spydercos (M, F,...