Dou Xian (竇憲 dou4 xian4 50s - 92), leader of the consort clan Dou, first of which engaged in the struggle for power against eunuchs in the Chinese Eastern Han Dynasty.
... to make the gyro fall over.)
The axis of the gyroscope in the Dynabee is fixed to the spinning mass and it rests in a little groove inside the wrist exerciser ...