• Does anyone know which shop I can go to that will be able to grind/cut out an old rivnut/Nutsert and install a new one for me?

    Cheers

    If the old ones are loose it may be possible to pull them up again with a nut setting tool.
    I have such a tool.

    Alternatively you are probably best leaving the old ones in and getting new ones placed just above/below the original ones.

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