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Correct - the outer sphere turns clockwise to close. If after you've cut the tabs on the bottom the whole unit seems rock solid, that means that the outer sphere has not been broken free from the base ring. This is where you stick a flat-blade screwdriver into the gap between them and pry gently upwards. If there is some movement of the outer sphere, but it still won't close, then the leafs are stuck. You may be able to shove a thin shim into the gaps to try and free them. Studying the semi-transparent CAD image will help you see what is going on.