Star nuts are not really design to be removed. The shaping of the star prongs means it will only go down not up in the steerer. If it really is stuck one solution is to drill out the thread on the existing star nut to clear a new threaded bolt and insert a new starnut one over the top when you figure out how to get in there.
Star nuts are not really design to be removed. The shaping of the star prongs means it will only go down not up in the steerer. If it really is stuck one solution is to drill out the thread on the existing star nut to clear a new threaded bolt and insert a new starnut one over the top when you figure out how to get in there.