The woodworking technique of tapping and compressing the tenon when making a joint is called kigoroshi.
Make a tenon that is a little larger than Mortise, do Kigoroshi, and then assemble it. It is important to use the rounded surface of Genno and hit the wood fibers with uncut force. After assembling, it absorbs moisture in the air and swells, fits tightly without gaps, and finishes firmly.

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The woodworking technique [Kigoroshi]