I ordered 4 of em from FT, going to mod them, currently the “pill” is just a plastic block with what looks like a joule thief type circuit in it
approx 16mm~ driver diameter
Outside diameter of the pill.driver is 17mm~
The reflector is held in by the front glass that is popped into a grove in the head, it is approx 20-21mm diameter
More measurements here
I have two of these TIR optics coming in to see if I can put that in, then maybe use a snap ring to hold it in
https://www.fasttech.com/p/1187501