RickH wrote:I hope you loosened it first (then it shouldn't need hitting)! If you completely unscrew the bolt you will find it has an internal hex to fit an allen key to undo/retighten (after moving) the bung. Just hitting it back in risks damage to the steerer.
The bit I hit did not appear to have any bolt(s) so couldn't loosen anything, it appeared to be an interference fit inside the steerer tube.