>. Logic would tell me that it
> should be the opposite (a wood expands with humidity)...

Since it is a wooden shaft in a hole cut in another piece of wood, I
suggest that what matters is which piece of wood expands most.
i.e. if the keybox shrinks with low humidity more than the shaft, the
keys will stick.
A small piece of wood will react quicker to a humidity change than a
larger block, but if the change is prolonged, sooner or later a large
piece of wood will react too.

Paul

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