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I have never heard a starter make this noise or wear out the bearing and bushing. The armature looked nice and clean so I don’t think that wear is a big problem. It had only been making the noise for a month or so. I did not feel any play either. I suspect the brushes will need replaced before the bearing and bushing cause the noise to come back i would think if they went dry and that did not cause them to go way out of tolerance then having lubed them should be good for a another 30k. By then the brushes will probably be a bit short. Finding any of those parts sounds like a challenge. I suspect a used starter would be the thing to pick up when I see one on ebay.