Nautilus 2s (TPD version) - problems changing coil

I'm now on my 2nd Nautilus tank.

I seem to be unable to unscrew the metal base in order to access the childproof lock. The 1st tank I purchased was changed because of this issue but the replacement is exactly the same so I'm wondering if I'm doing something wrong?

When turning the base clockwise the outer sleeve and mouthpiece come apart leaving the glass stuck to the base. The only way I can change the coil is with a pair of pliers. Grateful for any advice you can offer :)

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