The axle would snap the string easier, I think that is what he meant. Also, NO OFFENSE, but I don’t see what you are wanting us to do. Yeah the string broke. Yeah it could be the starburst, Yeah it could be the String’s fault., I mean, YYFben already said to contact info@yoyofactory and see what they say.
That being said I would be MORE than happy to help with anything the best I can, I just think that there is not much more we can do to help you.