A friend I built a double strung tenor guitar for was digging a hole through the top of it. After about a year the finish was gone and some of the wood was starting to be excavated. It was a slow gradual process. I put a thin tortoise shell colored guard over the area he was damaging.
I have seen a number of old guitars that have had wood worn away in the area pick guards are normally applied. I don't install them as a general rule, but sometimes they are necessary to protect the instrument.
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