Two reasons of making warped plane blade flat (and how to do it)./なぜ捻れを治さないといけない？捻れ直しのやり方は？ 

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道具日記
DIARY OF TOOLS
Two reasons for you to make the warped plane flat.
If the plane blade is warped, it will have a poor fit with the wooden body. Also it's very likely to create a baldly formed Ura---Beta-ura (ベタ裏) when you grinding it, and therefore you have to do Nejirenaoshi (捻れ直し) to make it flat before you actually grinding it (Uradashi 裏出し).
Notice: The chance of warped blade (Nejire 捻れ) for high-quality Kanna is much less than the normal ones.
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