The butt cap of my racket is moving during my game, what should I do? 10 May 2018 15:14 Updated Follow Contact the Babolat Play Hotline . Our Play expert will be able to help you. Related articles What is 100% of power for a forehand or a backhand? My butt cap trap opens during my game, what can I do to make sure that it won't happen again? Why do we only have a percentage of power, and not a ball speed (in km/h or mph) for the forehands and backhands? My racket doesn't switch on, why? Yellow Light Comments 0 comments Article is closed for comments.