Small Engines (Lawn Mowers, etc.): echo weed whacker, weed whacker, chainsaw


Question
 I have had the pull string on my machine replaced twice>It now has broken for the third time. At this point I would like to make the repair myself. How do I go about it and is there something that has to be looked for in order to stop this problem from occurring

Answer
http://www.youtube.com/watch?v=eRyy3MlsjVo

The above link is for a chainsaw but the repair is the same once you remove the starter.

Is the hole in the starter housing, where the rope comes out, wore or  have a sharpish edge causing the rope to wear?

Let me know if the video helps.
Eric