Here is a diagram showing the wheel while it is spinning. I left off the vector representing the torque because it would be out of the screen. ... Angular momentum is a vector; ...

Let me start with a diagram showing you just before and right after you step off. ... (which really should be a vector). This means that the angular momentum does not change.

Through weak measurements of orbital angular momentum and strong measurements of angular position, we measure the complex probability amplitudes of a pure state with a dimensionality, d=27.