Hi! I have a Darton Vapor that has small round rubber coated things on the end of the string. I'm not sure what they do. The rubber has a chip in one of them. I was wondering if someone could tell me if it's something that needs to be fixed now. Archery season opens on Saturday so of course I'm cocerned about it. I'm attaching a picture for you to look at it. Also I had it at my archery shop this summer and they said the string looks good however I just noticed this this morning. Thanks alot!