DIY experts discuss the old-school method of drilling holes.
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The spoon auger is shaped like a gouge; hollow and rounded on the end. The shell was shaped like a snail and used for drilling holes and countersinking. A spur style bit is a more modern type of bit, with a pointed cutting edge and a spur to shape the rounded hole. The most modern of the examples is an Archimedean-style hole. The twisted metal helps pull shavings out of the hole.
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