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For some reason, I can easily open it with my hands, but I can not, if my life depended on it, close it hands only. I mean, I can close it, so it works, but to align it? No wayYes it is a single-thread spiral. But it should not require so much force to open or close. I am not asserting it *MUST* be open underwater (even if someone wants it) but I like to open and close it without any tools even with a bit of force with dry and not slipping hands.