Yep...
Had one for about 20 yrs...
Got it when i broke my wrist and dislocated my shoulder in a motorbike, (scooter!) Accident...
Spin it up with the string...
Then 'stir' the wrist... like stiring a cup of tea or slight 3D 'whisking' motion, like whisking eggs... close to the body... Start slow, below the gyro speed the speed up till it 'catches'... thats the tricky bit... you are trying to throw the weight to the wall of the ball... Then speed up the wrist rotation to acceletate....
You can then try with arm up or outstreatched.