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For the lifetime, Petzl wrote that in the technical sheets for their products (helmet Vertex Vent in this case) : More over, this helmet (I didn't look for others) has a 3 years guarantee, so trashing it after only two years would be a pity. Except if it is damaged or suspected to be.

It happened to me too 5 or 6 times, but not a total disconnect though. Well, almost. The triple action (push, rotate) isn't safer than the double one, just combine a slight backward movement with a side way displacement against the bark and you open it. Same if the second rope is rubbing...