When you are engaged in creativity, in the sense of doing something without a project, you start improvising in the process... and in the process, I decided to make descents to zero, but the descent from the middle turned out to be too high and the edge could not stand. I sawed down to 0.2 mm and did everything according to the classics.

Sources: the knife is from a jointer, the steel is declared HSS, the exact composition is unknown, the handle is a thermal belt.