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How to Make a Pump Drill

paleomanjim 141,136 lượt xem 10 years ago
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Shows how to make an ancient Pump Drill using simple materials that are available anywhere. We begin making the spindle and handle followed by an easy to make cement counterweight. Next we attach flint drill tips to the end of the spindle and test them out on various materials. Finally we flintknapp a flint drill bit showing what seems to work best on drill bits. Enjoy!

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