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  • Am I reading this right;

    1. You want to stop water entering this hole,
    2. you want it to have a flush fit, and
    3. You want to be able to remove it?

    If yes to all 3 then you want a nylon grub screw with lashings of blue threadlock.

    Edited

  • Yes, although after looking closely, turns out there's no thread, so might have to tape over it or any other suggestions welcome?

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