Cascade baby TPD limit removal

[peeblebox]

Hello,

I've recently brought a Cascade Baby tank after trying it from one of my friends. Since I bought it on the UK it came with the limitation of 2ml refills. However the one my friend had could be made 5ml just by removing a piece of rubber that was placed inside the tank. After getting mine I noticed I had no rubber piece, and instead mine contained some kind of metal ring.

I've managed to disassemble the tank, but I cannot figure out how to remove the metal ring. I've trying turning it on both directions and attempting to pull it off from the top, but no luck. I'm attaching a couple of photos in case anyone can provide some insight on how to do this.

Thanks.

 

[Deepwinter]

I have one of these, can you tell me how you managed to disassemble it im having trouble breaking it down.

I wanted to see if I could use a bubble tank on it, i know the smok 3.5ml bubble tank works wi the NRG mini, i thought there might be a similar option for the Cascade baby se mini.