Munk and Sarge have it right.
In another bit of my life, I play traditional Irish music ... wooden Irish flutes. These are most often made with a brass or silver tuning slide inset into the head and the first joint - the wood is slipped over the metal tubing, and glued into place.
Virtually all of the antique flutes have cracked. The wood has shrunk over time, and the metal underneath has not! Various fixes for this, but the biggest "fix" is to construct them differently in the first place, so the pressure won't build up. In knife terms, I'd expect cracks to show up where slab handles are pierced by metal rivets.
It's the price of admission. Worth it, in my view.