Humidity crack.
Tonhole cracks

The most worrisome crack caused by moisture is a crack that goes through a tone hole. Passing through a tone hole will result in a leaking, unpredictable instrument. These cracks should be taken care of as quickly as possible. L&P offers a tone-hole crack prevention, which almost entirely eliminates the possibility of tone-hole cracks.

Don’t get the instrument pinned under any circumstances!!! (Read also: Crack pinning )

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