The M21A has the same narrow beam and weak flood light as the C8+?
As far as I can see, if the beam pattern is the same, the brightness is doubled compared to the C8+ (8x7135), which I could be interested in
What size is the head?
I have some 20mm and some 25mm round stock aluminum i can turn into a spacer. Just need to cut it the right height and drill a hole in the middle.
Simon, please feel free to correct anything I have wrong (reflector shape isn’t accurate, though)
The main thing I don’t have in there is the indentation in the pill itself - as noted in this thread on /r/flashlight , he made a spacer with a cutout for the MCPCB and an extrusion to fit in the existing MCPCB “hole”.
Kiriba-ru made me 2 versions of the S11 spacer based on the dimensions posted to the Reddit thread. One was pure copper, the other was a copper core with a brass support ring to keep the optic in place.