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“Could you elaborate a bit on the subject?
Why do you have to roll up on the concave and down on the convex? I would have imagined it was the other way around”

I did not explain that well, If...

If you lay the blade on a flat stone, you will see that it does not lay flat and the four corners at the heel and spine do not all touch the stone, One or tow corners will be off the stone. The warp...

Oh, it’s warped, but not impossible to hone.

Honing a warped razor with straight strokes will produce a frown, especially if you use too much pressure or low grit stone.

Measure from the top of...