Letting the linings into the blocks on a bass is unnecessary. It is done as a way of showing off the maker's skill. As Matthew stated, a well-glued joint will usually outlast the maker. Linings are temporary. After several plate removals (for repairs or alterations) the linings deteriorate, especially on a bass. Eventually they need to be replaced. For example, when I restored Ken's former Gilkes bass, all 12 linings were replaced. Rarely does one find a very old bass with the linings intact. I personally use only two wood types for bass linings; spruce or willow.
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