A part that fixes all types of kumiki, and transforms them into unified structural members

Sen (pin/ plug/ key) is a supplemental part, used with various types of kumiki. It is used to improve the strength of the joint, or completely secures it by inserting Sen into a designed gap of the joint part. In order to withstand the pressure applied at the part where Sen is inserted, harder wood is used for Sen than the joint members. The completed kumiki can be regarded as structurally unified piece.

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