i used a belt grinder along with some gator and scotchbrite belts (never touched the edge with them though).
Some shinogi lines will become wavy no matter what, due to high and low spots above the bevel. However, the rest is just skill, practice, and experience.
On the yanagiba... aesthetics... the jinzo aoto leaves a stupidly nice and smooth finish. I can make the edge whatever i want after that.
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