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				| On the flip side
 Here's why I started with a #30 drill bit. I knew that I had to countersink the skin and the part behind the skin, and the only countersink bit I had was a 1/8" countersink. So I did my countersinks and checked them with the screw head that goes in these holes. If I had drilled these holes to their full size, the countersink bit would have danced around and made a lousy countersink.
 
 
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