I found this tour of the D'Addario string factory very interesting. Check out the video on how the winding is installed - I always wondered how they did that...
http://www.themusiczoo.com/blog/2010/factory-tour-daddario-strings/?utm_content=bpguitar%40charter.net&utm_source=VerticalResponse&utm_medium=Email&utm_term=See%20The%20Complete%20D%27Addario%20Strings%20Factory%20Tour&utm_campaign=D%27Addario%20Strings%20Factory%20Tour%20%2B%20Planet%20Waves%20Gearcontent