Unless you have experience with traditional boatbuilding or making traditional Japanese sake cups, you may not realize you can join two pieces of wood together–with no glue or sealant–in such a way as to make the joint watertight. Here master woodworker Frank Klausz reveals the trick taught to him by his grandfather, fabricating a helpful tool out of materials you probably have lying around:
It is indeed a clever technique, exploiting the behavior of both wood and water, and this is the first time I’ve seen it demonstrated.
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Source: core77