Nice teardown info and pictures. Thank you M4D M4X.
the original K40 didn’t have this brass retaining ring
R082 resistors at the upper right. modding time 
thanks for the pix!!!
first i managed to rescue Mode 2 
not best soldering - but thea are sooo tiiny!
then i opened the light again to ad a R100 to the sense Resistors:
| L1 | 0,024 | 0,029 | +20% |
| L2 | 0,83 | 0,95 | +15% |
| L3 | 8,6 | 11,36 | +32% |
| L4 | 21,8 | 28,1 | +29% |
| L5 | 37,2 | 46,3 | +24% |
| L6 | 60,1 | 73,2 | +22% |
kLux measured at 107 cm with HS1010A
The light gets hot very fast at L6 
Lux drop to 69 kLux @30 sec
Sir m4d m4x, how do you turn the brass retaining ring in the tail cap? Clockwise or counter clockwise… im trying to open it but no success. Its too hard to open… tia
I tried opening the tail cap again but i cannot open it at all…the retaining ring is kinda stuck… so it means i cannot replace the tail cap… i emailed acebeam but the reply only says to have it check to whom i bought it… i thought acebeam support international warranty
I will check for the brass ring of the Reflector tonight…
which ring in the tailcap?
why do you open that?
Yes sir… ring in the tail cap… to access sa tail cap boots…
I just trying to open it i know if the tail cap boot are replaceable… but i cannot open it….
that silver ring opens counterclockwise…
I tried your technique using a needle nose pliers but still no success…. its too hard to turn it… i thinking that it is kinda stuck…
Nice teardown with good pictures, enjoyed that :-)
That is not a silver ring… it is a brass ring… the 4th picture you posted…
Just turn harder, often the aluminium threads when they aren’t lubricated grab onto the brass retaining rings. I had to pull a brass pill out of an aluminium host the other day and it needed two people to do it. One holding the body with a rubber gripping cloth and one with the circlip pliers with a bar going through the handle for leverage. Once it came out it was fine, but there was no lubricant, no threadlocker etc, it was just really tight and had stuck in there.
Are you sure sir? Because i tried it both ways but no luck of opening it….
I stopped trying to open it because im damaging the ring
I dont want to try it harder cause im damaging the ring itself….
Are you using circlip pliers?
Actually not… im using needle nose pliers that have a nice fit in the ring…
I really trying hard to open it but no success really….
Im thinking if the ring is glued?
hmm I’m not sure then. Try heating the whole thing up by putting it in a ziplock bag in boiling water. Aluminium expands more than brass does so it might loosen up.
Plus if it is glued it will help to soften it.
I dont want to try it anymore…. because it my bring more damage to the tail cap… besides i just trying to open it out of my curiousity…
But the sad part is that it is not that accessible to open it…