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.
The inner diameter of my L21A is 22 mm as well, Samsung cells fit, but Shockli cells did not fit.
Adding 0,6 mm will make a lot of difference, or the cheaper manufacturers could just produce cells that comply with the standard 21700 = 21mm x 700 mm… :person_facepalming: