Those are tank style...they don't have threads like a regular vivi nova mini? The top and bottom knurled ring on the Vivi nova mini's unscrew off the tank...hmm
Don't glue those!! You won't be able to change the heads out!!!!
Investigating...don't do anything permanent yet!!!!!!
OK, the way to know if you can do it permanent is if you can remove the coilpack and bottom piece separately, if they are ONE UNIT, do not make the fix permanent or you will not be able to get to the coil to replace it, if its a little module that screws into the bottom piece then you can glue the bottom piece to the tank.
On the regular top coil vivi nova the entire bottom cap unscrews off the tank
OK, I think I found an image, the bottom appears to be threaded not press fit
If yours does this...don't glue the ring on the tank!
I do see what you are talking about now though...the screw on knurled ring piece and the base plate separated because they are pressed together (regular vivi nova is one piece, new design so new engineering)...gluing may work (metal on metal super gluing isn't the strongest bond though)..just don't get any glue on the threads or that gasket
Follow what I am saying
Other solution might be to get some vice grips and see if you can gently squeeze just the ring where the base plate and knurled ring meet (but you have to be crazy gentle)
Suxors that such a new device is already showing weaknesses...
P.S. sorry for the way I posted..I was investigating and didn't want you to make a irreversible mistake