The present technology derives unknown user characteristics from known user characteristics. Furthermore there may be multiple destinations that can receive a particular type of media component and the media must be received at each destination without losses. The bushing has an engaging part over the bottom thereof and the engaging part integrally extends from the inner wall of the bushing and forms a plurality of projected and elastic plates capable of being inserted in the scoop channel over the end of the shaft to replace a snap ring such that the shaft and the rotor can be integrally disposed and positioned to prevent from falling off. The neck device is actuated by the motor to move along a third path.