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FWIW --

I got a Norton 4K/8K from Lee Valley Tools a month or two ago.

The blue plastic box/bench stand has two stickers:

"Made in Mexico #24336" ( I think that's the Norton part number)...

There are several possible causes:

1. Razor edge has a "smile" -- the blade is wider at the center, and narrower at the heel and toe.

To sharpen a smiling blade, you must use "Rolling...