So, today teacher asked me some information about the emitter board and the driver, and it drove me to take some more photos!
I took the 2 “retaining” screws out and rotated a bit the plate. Please note that there was just a few thermal paste below it :person_facepalming: I added some when I put it back in place. Please check yours when you got them! There is much heat on max output and without copper board and without thermal paste…damn, it will not be harsh for the LED!
Emitter board is 20mm diameter and 1.5mm tall (as I suspected). It is aluminium and…I think that a copper MCPCB would be a lot better in terms of heat dissipation!

The driver is 20mm diameter as well. It is glued with white glue and I didn’t take it out.
The “shelf” must be between 2-3 mm and there is small space between the driver and the shelf. The wires are a bit hard, so carefull if you pull them out, it will be delicate to put them back in place.

I also found an o-ring on the upper threads the “pill”. Hadn’t seen it before, it was concealed :person_facepalming: 

Hope this helps in some way 