Step 2: Open that baby up

Picture of Open that baby up
Inside you will see a plastic hub and 2 steel pins.
In my case it was the steel pins that broke, in other cases it is the plastic hub.
If your plastic hub is broken you may need to measure and 3D model to 3D print that component.
If  if it is broken steel you got.  3D print your replacement parts from Shapeways in stainless steel .
They should cost you around $11 each