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As a retired manufacturing quality engineer, I think you are missing a couple of points. 1.) The surface finish of the machined casting is just fine for a compression/friction joint. A rough surface finish will hold in place more durably. eg. a polished surface would be dangerous. 2.) You do NOT...

That type of scuffing is pretty common on pickup truck's undermounted spare tires. Not worth worrying about. just make sure it is snugged up against the frame so it is not moving around.