How to make a primitive cord drill and pump drill

These types of drills - built with metal as well as wooden parts, are still used by some bench jewelers. With a little practice they can be operated one-handed if required.

They were featured on Make Magazine online a couple of years ago:

http://makezine.com/2013/02/26/tool-tales-the-pump-drill/

More information here:

http://thesilverforge.com/tag/pump-drill/

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