Originally Posted by Andrew R Stewart

To my eyes it looks like the tabbed lock washer has become rotated on the steerer and it's tab is not jammed on the steerer's threads (and no longer residing in the steerer's groove). The usual fix is to grab the outer edge of the washer with a large pair of slip lock pliers and rotate the washer back so its tab reengages the groove. This tab out of groove rotation is fairly common and easily worked around. I know of no threaded race that has a tabbed aspect as that would preclude the threaded feature from being used Andy