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@ugosantalucia
The reason to use copper paste is to prevent aluminium bonding to stainless steel, which a known electrochemical process which happens over time. Alternatively you can dip the threads in a low viscosity, low strength thread lock, like Loctite 221 and wait for them to dry out, which in the case of stainless might be a while. Shimano do it rather successfully in their mid range wheels, like RS 81. You need to get the right thread lock though, as if you use a strong one you might make things worse