I didnt tell them serial #s either , they are shpping me a new one and want me to return the old one in the same package , I explained the problems I was haveing with it , severe fletch contact , and that was their solution . The reason I got intresed in the rest again , it was sitting on my shelf for a year1/2 ,is because a fellow hunter at elk camp was useing one with great sucess , great clearance with nap quickspins , and I know even slight contact with those vanes results in bad wrincles .