T100C2 UI & Head dissassembly?

[Anto]

Has anyone here opened up a T100C2 head? I'm examining the ring and I notice two notches spaced around the board that might be used for unscrewing. Unfortunately mine won't budge..
Picture:

 

[notsobrite]

 

[Anto]

I'm thinking since the notches are on both sides, there has to be a way eagletac gets the mode switching ring on.. maybe a tool shaped like this:

That goes into the head to unscrew it..

I've also found that the threading for the head goes all the way down past the heatsink.

I'm thinking if I dimple the metal head below the brass spring, I should be able to stick some needlenose pliers in there and unscrew it?