Quoted from DrMark12PA:Will the vibrating tumbler help with pieces as picture below (a lock bar handle)? I've already polished it with "Liquid Metal Polish" and a paper towel so nothing overly aggressive. It did shine up parts of it but it still has very shallow pitted areas of rust/black.
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Get a product called Evapo Rust. Let that handle sit in it for 24 hours. Rinse with water, dry, then run in the tumbler. It will shine up nicely. And the pitted areas of rust/black will be gone.