The end cap keeping the ball on keeps coming off?
– the black cap you have could be loose. We always enclose a small paper envelope of spare parts containing the retainers and elastic bungee.
Please use a new one, or preferably that you use the spare PVC tube instead of the black end cap.
– Your racket tip is too close to the TopspinPro – see this pic for an explanation.
Your feedback and opinions are valuable and appreciated.