• @Pifko that’s kind of what I was thinking. My optimism around getting them in a good state out are pretty low as I’m worried that the screw and thread are bonded by rust/corrosion. So I think that could be an option.

    @Ndeipi that’s very kind of you to offer. I think that could be a good port of call before researching more into drilling.

    Thanks all for your suggestions - as always, much appreciated.

  • For extra purchase try a rubber band between the bolt and the hex key. It's surprisingly effective.

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