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OK - the bungs usually work buy pulling a cone shaped collar up in to a metal tube, expanding the tube and then gripping the steerer. Because the tube is divided in to four quarters, held together by a rubber band / o-ring that raps around it, it expands as the cone moves in to it.
What you need to do is push the cone down and out of the tube, which will allow the tube to contract and reduce the pressure on the walls of the steerer, and then be released.
To do this, try screwing that thing in your hand back in to the bung a few threads , then give it a gentle tap with a rubber mallet. I assume its the larger of the two threads that screws in to the bung.
Howard
how do i tap it out? i dont understand, sorry for sounding dumb.