As I recall, I learned this at lighthound.com ...

1. Obtain a plastic drinking straw larger in diameter than the cord. Last I knew, McDonalds has some really wide straws, if needed.

2. Cut one end at a sharp angle with a very sharp knife or scissors - so its really really pointy.

3. Cut across the non-pointy end of the straw to shorten it to about 3" long.

4. Use the knife or scissors to slit the straw open lengthwise on the side opposite the point tip.

5. Spread the straw open and insert the end of the cord into the straw with the cord trailing out the non-pointy end. The straw should close around the cord.

6. While holding the non-pointy end of the straw firmly, insert the pointy end of the straw into the cord lock hole and push the cord into the cord lock. At some point you should be able to pinch the straw and pull it and the cord through the cable lock.