Tips: Wrist unit is a precision instrument， we sent the ball before each wrist will check whether the successful start， rotate freely whether to display the count of the counter， there will be no quality problems correctly. The most important point is that the ball does not fall， fall to the ground， inside the central axis of the bend， the ball is not in a horizontal plane， so turn up the center of the sphere teeter ball noise becomes larger， or a direct not turn! After the demolition of a number of balls found Powerball fell bad repair， the ball shaft bent useless orbit slot also thrown out of the sphere dent. If you want to repair， spare parts price can be re-buy one! Did not throw the ball dropped， as long as the open end of the shaft is a look at two on a horizontal line， there are no Indian wrestling can be determined!