That's odd it should definitely unscrew, perhaps use a little penetrant, WD40, GT85 or ideally Plus Gas, then try again. That nut should definitely unscrew, that's why the sides of the lock nut are flat...
perfecto, that worked, thank you. It justs clears the bottom of the headset now, need to find some spacers now!
@inkleined started
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That's odd it should definitely unscrew, perhaps use a little penetrant, WD40, GT85 or ideally Plus Gas, then try again. That nut should definitely unscrew, that's why the sides of the lock nut are flat...