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Gold flakes in the motor (if metallic) are typically from your bearing shells. "Sparkles" I'd consider normal-ish, depending on the mileage of the motor. But flakes I think I'd be more concerned about. Especially if they keep coming.
Any chance they're silica, not metallic? 0.5mm is not much to tell from. If they're flattened like flakes, they're almost certainly metallic.
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