I recived Bengall 5/8 full hollow with frown and smile on it (they are about 1 mm in deepest point). Frown is from the heel to the middle and smile is from the middle to the toe.
So, I need advice about straightening the blade.
Will you reccomend "bread knifing" or some other technique to straightening the blade and to start setting bevel with straight blade not one as I described above?

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Thx