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Ben689908
Maybe the compression ring has just circularised the steerer🙂 I'd buff down any raised burr with some fine wet-and-dry and then take diameter measurements at different points and angles to see where you stand. A blade micrometer will be handy to get into any groove features, such as Mitutoyo 422-331-30 from e.g. https://www.tester.co.uk/mitutoyo-series-422-digital-blade-micrometer-0-101-6mm-0-4-blade-options (no relation)