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Hard to tell in the pic but does the hollow angle have a hexagonal hole, for a 5mm Allen key? Often, hubs that don’t have opposing nuts on th NDS have that.
If the diagram is accurate, Another possibility is that the metal shield around the cone on the NDS has shifted outboard, covering the interface of the cone that would take a spanner. If that’s the case, some wd40 or a hairdryer and some gentle taps with a hammer and punch might be enough to move the shield inward. Edit- from the pics it isn’t obvious what the issue is.
Adhiero-
Basically, its that outer most bolt that is stuck. Just wont budge. Tried as you suggested with wd40, and as @Alexnharvey suggested with the nut on the other side but still no luck. I've leant it up against the radiator for now, and i'll come back to it later with a hairdryer to see if the heat helps loosen it off.
I don't want to go at it with a hammer just yet, as the cone on the DS is still attached and I don't want to damage the bearings. If I can however get a tool inside the freehub body to grip the cone nut on the DS, then I might be able to get some purchase on that pesky NDS lock nut. I tried with my pliers gripping the DS cone bolt but it keeps slipping.
Also checked already to see if I can slide a 5mm or 4mm inside the axle and there's no hex hole unfortunately :-(. If I can't sort this afternoon I give the LBS or local engineer a ring I think!Thanks a lot for all of your help and suggestions! I let you know if I manage it :-)
g_woodland
here's the lock nut in question...