True but also the slug goes down inside pretty deep. I assume the drill penetrates the core. Therefore the vibration from the pounding is directly on the core itself.
Like the 6th grade science experiment where we had to find a way to drop eggs off the roof without them breaking. I cut open a Nerf football and placed it inside. My egg did not break. Now pound something directing into the ball. Splat! What I'm saying is most of the abuse is absorbed by the cover. (Aside from aging & temp)
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