Here is an easy way to make more string for your Yo-Yo, just like the kind you would buy from Duncan. String is about 38 inches in length. This method can even be modified to make rope.
I did not come up with this method myself, I found a video on YouTube. I just improved the method a bit.
Update July 22 2011:
Wow, I got featured and on the front page. Thanks Instuctable editor(s). To bad I never updated the pictures like I keep planing to do.
Step 1: Gathering Materials
*Block of Wood about 5.5 inches X 8 inches
*Marker or Pencil
*Few nails (Finishing)
*Wood floor or long wood board that you can mark up and nail