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@Monty_Dog
Sounds like you just need more leverage - stand over the wheel with the chainwhip in your left hand and the lockring tool in the other and give it a good firm grunt. Ambrosio hubs are rebranded Novatec and use standard cartridge bearings - if you can get a grip of the spanner flats in the spindle with the lockring in place then you can remove the spindle and freehub.