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What's the purpose of a pilot hole?

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Correct Incorrect They prevent wood from cracking under the pressure of a screw--Pre-drilling helps reduce cracking when you add a screw. Though wood might not crack without them, pilot holes are a good insurance policy for strong joints. (Photo: manmadewood.com) 

What's the purpose of a pilot hole?

They help prevent measuring errors
They allow beginners to practice drilling cleanly
They aren't actually necessary with modern tools
They prevent wood from cracking under the pressure of a screw

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