I recently used my own very straight hair on this one.
http://www.coolminiornot.com/101106
Usually I just wind the hair around the ends of the bow and secure with superglue.
On Iridril, a hole was drill in each end, but not all the way through. I then completed the hole with a much smaller bit. The hair was two strands tied off at one end and threaded through. Carefully bending the bow the other end had the hair threaded through and it was tied off as well. When I bent the bow back it made the string taught and it was again secured with glue. A few stripes of tan paint later my bowstring was finished.