Physics joints on bones?

I'm trying to create some rudimentary jiggle bones for an otherwise animated object in my game (I am trying to add physics simulation to a bone in a typical armature hierarchy), and I've got this so far:

• Create an avatar mask that disables animation for the bone in question
• Created rigidbody for the base of the object (kinematic) and for the jiggling clip part (non kinematic, has gravity)
• Added a hinge joint to the jiggling clip that connects to that parent part and has (currently) no limits or limits of -180 to 180 (free rotation)

Currently it doesn't move - at all. I've experimented with the following:

• Changing/removing the limits
• Adding springs
• Having a fixed anchor rather than a rigidbody
• Adding colliders
• Changing the axis

Nothing thus far has worked. Is there some setting I'm missing for simulating rigidbody bones?


Screenshot of my setup: