I have exactly the same issue. Cap just spinning as if there is no thread. I don't think there is a technique to it. ..it's the same principle when unscrewing any cap with a thread. I've only used it 3 times!
KIM H
May 2016
Either the cap is defective or you're using the wrong technique - careful examination might provide a clue.
Good Luck...
February 2016
Automatic Answer
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