Am I reading this right;
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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Sugru, or the diy version using corn starch and silicone.
You can get these caps for hex heads
Find one that would fit tightly, clean the area, tiny dab of superglue on one side of the hole. Superglue is quite brittle so when you want to remove it, give it a little tap first.
Should be a very neat solution.
Apologies if this is a silly question, but why do you think it needs to be closed?
Can't see why moisture would be trapped in there and not just evaporate.
@lahdelah started
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Am I reading this right;
If yes to all 3 then you want a nylon grub screw
with lashings of blue threadlock.Edited