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kobo said..
Thanks, I unscrewed it and it's just a stainless screw with an o ring, so I guess you leave it open in hot weather or while out of the water.Just have to remember to tighten it before using.
You don't ever have to open it, unless you take it on an airplane, or do something dumb that bakes it to an extreme level. Like locking inside a hot car while you're at work all day. More people ruin boards by forgetting to tighten the screw, than damage from heat.