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Nakago jitate (core shaping)

Nakago (core) is finished with a Sen (a grinding tool) or a file, and for a Mekugi (fastening pin) hole used for securing the Tsuka (handle grip), usually one hole is drilled and two for a sword used for Iaido (Japanese martial art). Then, Yasurime (to prevent hands from slipping on the grip), which is unique to sword craftsmanship, is added.