I started with the driver contact board
Then I moved to the other end and made the battery contact board
My soldering is not the neatest but hey it's my first attempt
all that was left to do is file a little of the inside of the body
and job done
Hope these pics are ok 
nice job there, thanks for sharing, I’m hoping you get the taste for this as you certainly have the talent.
Well thank you gords, trouble is there is only so much you can do in a small shed
and and basic tools but will try my best.
That's actually some very nice work! I think with the body not getting any smaller I'd stick with the 4*18650 format with the SRK since the overall capacity and runtime would be far greater. Even just 2*18650 would give more capacity than a single 26650. It's an awesome idea though and you executed it very well!
I think your positive contact mod would be great on all SRK lights as the etched on contact trace doesn't look too durable. Your solution would hold up fantastically and last nearly forever.
Nice use of copper, for the contact plates. Well done.
Looks like it’s reversible, too so you can go back to 18650’s if you wanted to.
Yeh just take the end off undo four screw put old contact board back and your good to go
Nice mod. Is it much lighter? One would think so.
+1
Keep em coming! 
All in about 1.5 oz lighter so not a huge amount :)
still a good effort especially in a shed with few tools, pat yourself on the back from me!!
Will do tabetha
think I may have the modding bug now got a convoy C8 diy host to do now :bigsmile:
ps have you herd of beers of Europe ?
Nice work. Looks like you have enough room to add 4 springs so you use 18650’s without changing the plate. They may need to be a little off center to not hit the 26650.
I was thinking of doing something similar to the Rook. The center section of the Rook can be used to power the light. I wanted to have a hole in the center of the bottom plate to accommodate a longer cell, but still be able to use AA’s. I couldn’t find enough room. So now I’m just going to throw a free floating plate in the bottom after boring out the center divider section for a fatter cell. Wanted to keep the battery versatility. I think I like your approach better for higher current flow.
I was only thinking of that today and I think if I use slightly shorter springs it should work fine
I love it here on BLF there are such nice people here who encourage good work from others :)