The guy over at the primitive technology vlog on YouTube  just added a neat video of himself making a cord drill and a pump drill.  <a href="http:&#x2F;&#x2F;youtu.be&#x2F;ZEl-Y1NvBVI" rel="nofollow">http:&#x2F;&#x2F;youtu.be&#x2F;ZEl-Y1NvBVI</a>