0 comments Manufacture assembling and joining 5 – SASHIKOMI Wood plugs are used to compose the top border (kamachi) with the 2 lower sections of one side. 6 – TSUNAGI Rectangular (or round) holes with a stiching pattern are hand-cut on the head of the long sides with the aid of a chisel. 7 – SLITS Tongue and groove joints are prepared on the heads to ensure solidity and to create a definitive barrier to water leaks. 8 – ASSEMBLING The 4 sides and the bottom are assembled. We use stainless screws to reinforce the baht-tub while keeping them invisible.