Help: Taking Fostex 825 Tweeter apart

Hi

Im dissembling this beast of Fostex T825 slot tweeter and cant get the cone plug in the middle off
If i remember right the Diaphragm was flat and the middle screwed...?
Shouldn’t be too different from JBL but miniature.
Tried to turn the plug counterclockwise. But it wont move.
Any recommendation?

I got inf resistance... wanted to check the leads.

Cheers
Josh

hi Anders!
Thanks, i didnt understand it well yet. How do you grab with a tube??

I tried with refrigerator, no success. Hoped the aluminum screw will shrink from the steel-plate. It should and probably did, but this thing still wont move a µ

cheers
Josh