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Should I be worried about the lead in brass nozzles?

No. Leaded brass is around 2 % lead and the wear is negligible. How much has your nozzle worn? If your nozzle has worn from 0.4 mm to 0.5 mm over that year, there's maybe $$ ((.5 mm/2)^2-(0.4 mm/2)^2)...
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