NEVER! if the vanes are fletched right, they should never come off. i shoot carbons too. and i do all my own arrows as well as all the work on my bow. i also like to experiment with different fletchings, different adhesives,etc,etc. i use steelforce glue and the steelforce spray prep. there are other glues that are extremely good as well. if you need/want help with set up i would be glad to help. there is also someone on this site that is offeringall types of work and his prices are really fair.