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What are "cranks"? Do you mean the scratches? Hard to tell how deep they are from the photo if so, that will determine what you can do to fix them. If not gone back to the metal, then you can use some cutting polish to fade them out, but the bare metal is exposed you will need a respray. To test, run your finger nail over them. If it catches in the gap, that is bad news basically, so fingers crossed.