• I don't think that it can be removed.
    But with filler (e.g. car accessories) it can be covered up.
    That may cost around GBP 10.-
    Really needs a paint job then.

    Frame builders will try to make it round with a clamp with a corresponding (25.4mm) diameter.
    In this case, I doubt if it will come out perfectly round and straight.
    Needs some filling with epoxy filler or silver solder.
    Filing and sanding to finish it.
    And re-paint of course.

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