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…
Funny thing i emailed acebeam asking for what way to open it, clockwise or counterclockwise? First acebeam replied turning it to clockwise to open it…. but no success…so i emailed again… acebeam replied trying to turn it counterclockwise…. showing only they are not sure which way to open it…… tsk tsk…
M4DM4X, in post 11, first pic, the resistor next to the capacitor might need resoldering. It looked weird from the begening. (Post 1)
i resoldered a bit… not a beauty, but works 
too small parts for my shaking hands 
edit made a video just for Mr. FOSSIL opening the tail cap of acebeam K40M: http://youtu.be/WquvRFsAWgA
Thanks a lot sir for the effort…. ill try it again…
Sir M4d m4x, tried it… and it works!!! Counterclockwise it is….thanks again sir…. :bigsmile:
Youre more knowledgeable than acebeam (acebeam emailed me clockwise 
)
you are welcome!
I have a Vinh K40Mvn and it is a Supbeam. The driver is slightly different than the one in our Acebeam K40M and looks like the driver from the Supbeam K50 group buy that I received. The resistor that Vinh added looks like a white zero ohm resistor.
Here’s a link to the Vinh K40M:
“K40Mvn (Must Have) | Candle Power Flashlight Forum
Note that Vinh says ”Mode 6 max brightness is intended to run on short burst only. Will get hot in about 3-4 minutes.” I can vouch that this is a true statement!
I will mod my Acebeam K40M and then probably sell the Supbeam Vinh K40Mvn…. it’s a very popular light but I don’t need two of them. :bigsmile:
Also would like to add that De-domeing the MT-G2 LED is great in this light. Really adds to throw which is super nice to have with the big refector in this K40M. And as you know the MT-G2 LED already is a great flood LED so dedoming gives the best of both worlds in this K40M.
Both of mine are dedomed and now I wish I had taken before and after beam shots.
Edit - Did a search and found these beamshots of the K40Mvn here, look at post #45 by mmander for the K40Mvn: http://www.candlepowerforums.com/vb/showthread.php?370723-Beam-Shots-Photo-Thread/page2&highlight=K40M+beam+shot
And then scroll down to post #52, #53, and #55 by birderbill for a dedomed K40Mvn beam shot.
I have a dedomed K40Mvn, somehow no one has measure this light, do you have an guesstimate on how much kcd does it throw out?
hey guys!
I measured the amps at the tailcap
(Removed rear switch and connected battery tube threads and outer ring of battery holder)
gave me:
| Lvl | Amps |
| 1 | 0.001 |
| 2 | 0.034 |
| 3 | 0.395 |
| 4 | 1.11 |
| 5 | 2.21 |
| 6 | 4.95 |
middle to outer ring of battery holder measured 12,1 Volts
(be careful NOT to shorten it with dmm in amp mode ;))
please give me your numbers…
Whaaa..that's exactly what I did...I tried to measure amps on the battery carrier positive and battery negative....Don't do that..
Thanks for letting me know.
Hi M4D M4X!
I have SupBeam K40M, and would like to make it more powerful as you described! But, my driver is a little bit different! Here is a photo:
What to do to increase the power as you have described? In my driver does not have those resistors (R082) as you have in the driver where they are you, my empty …
And the second question after removing the driver, lost 5 mode (1900lumen), it is necessary to watch the fifth (in a circle), a three-legged resistor, right?
Thank you! Sorry for my english (google translate)
yes - you ripped the 5th magnetic sensor…
(2nd picture / left from upper hole you can see it)
try to resoldering carefully
can you make another picture which shows what is beside the big yellow thingie?
Thanks
Oк, but later)
Hi Asian. I think the voltage sense resistors are on the other side (bottom) of your driver. I'm guessing you driver will be similar to the drivers in the TN31's. Need a picture to know. Or you could search for "TN31 mod".
now i am looking at your pictures on a laptop - a lot of the magnetic sensors look turned…
