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You'll need a more heavy duty corrosion penetrator than wd40 mate - I'll have a hunt in the garage for the name of some stuff I used to get the nuts off the swaybar mounts - they wouldn't move even with heat, buy let this stuff soak in over a couple of applications and they finally came loose!! Good luck with it and no doubt others may know the name of the gear in the meantime (small bottle - red liquid).