I think @Adhiero is probably right that the metal dust cap is obscuring the spanner flats on the cone.
You could try holding the drive side locknut and loosen the NDS lock nut away from it? The risk is that the DS loosens rather than the NDS of course. But with a bit of heat and penetrating oil on the NDS it should hopefully loosen first.
I think @Adhiero is probably right that the metal dust cap is obscuring the spanner flats on the cone.
You could try holding the drive side locknut and loosen the NDS lock nut away from it? The risk is that the DS loosens rather than the NDS of course. But with a bit of heat and penetrating oil on the NDS it should hopefully loosen first.