They make a steel flat bar about 1/4" thick by 1" wide that you put between the front sprocket and the sprocket on the clutch hub. The bar fits in the teeth of the sprockets. If it's the right length the bar jams everything up when you turn the nuts. You should take the adjusting shoe out.
Also, be careful if you remove the stator. There are magnets "glued" to the inside so you don’t want to be beating on it with a hammer. I've been known to use an impact gun when removing the nuts. Just make real sure you are turning things in the right, er, correct direction.
