Stuck expander/compression bung

So yes, you see the black cone on the base of the bung in my photo? On yours, that's stuck inside the metal tube.

You need to screw the thing in your hand back in, partially, in to the cone, then tap the whole thing down towards the fork crown with a rubber mallet. This will push the cone down, out of the metal tube, and free the tube.

Or just set the thing on fire