Here are some pictures I took.
I removed the switch cover so I could clamp it in a vise. Pieces of wood with a depression for the switch will also work. I found that loosening the upper head from the lower head removes tension on the bezel rubber seal which makes the bezel a bit easier to unscrew.
I had to use a lot of force and slowly unscrew the pieces. They are tight.
@Jason: Thanks for the picts - i think i saw them somewhere some while agoā¦ Damn, it does not look easy. I would have to get the rubber tools and a bigger viseā¦ Not sure iāll get into this mod.
How about heating the bezel wish a hair drier? It should dilate a little more then the head and become easier to unscrew? That may damage the lens though?
A lot of the resistance is due to the rubber oring.
The lens is glass so heat will not effect it.
I donāt know if heating the bezel will help or not.
I clamped the flattened part with the button on it in a work-mate. Unscrewed the whole top including reflector with a simple rubber strap shown in JasonWWās pictures. I didnāt really need the tool I think. Mine came loose easily, so I guess there is a lot of variation.
What a relief it is to have my GT70 back up and running.
I got my replacement LEDās in the mail yesterday and Iāve been hyping myself up for my first reflow attempt on an LED. I had a few practice runs- I used a hot air gun on the bottom of the MCPCB- holding it in place with some alligator clip helping hands. Holding the heat gun about 6-8 inches away seemed to heat it nice and steadily. The solder paste really worked like magic on it too. I was able to remove and replacing the dead LED on the other MCPCB with minimal fuss, using a big pair of metal tweezers. Once my hands had steadied out and I had some confidence I fired up the hot air gun again and had a go at the GT70 MCPCB.
It went surprisingly easily, the LED floats straight on to the pads and with a little pat down on top the excess solder pops out the sides. Beautiful.
I screwed the whole lot back together (with a liberal application of thermal paste under the MCPCB) and fired it up, and finally its back to itās old self blasting away the darkness.
Thanks again to everyone here with the advice and tips, guiding me on how to get this job done properly. You guys really are top notch. Hereās to hoping all my future work on this light is making it more epic with mods not just fixing it.
Cheers!
Nice! 
Are you able to send this video to me or tag the link. Iām interested but would technically be my first mod. handy with electronics and a soldering iron though.
Thanks
OMG TA what a monster is this, nice you got it going, awesome, congrats!
Yeah, the GT70 turned out pretty good. Have a look at the GT4 for an even more impressive version that is sadly not released yet.
How risky is dedoming? Would you recommend it? How likely is a sbt.90 conversion kit? Should I wait?
It has risks, particularly if you have not done it before. I tell people to be prepared to replace the LED before de-doming.
De-doming gives a good gain in throw but the tint suffers for sure. Personally I donāt do it to my personal lights.
Does it have the same effect on the neutral white tint led? Sbt.90?? Lol
Yes, the effects are basically the same on all of them. The CW is the least noticeable as a rule.
does lumintop have any plans sell this with the sst40 emitter ?
First you need to ask if there is any advantage to the SST-40 over the xph-35hi?
I think lumens is about the same, but SST-40 has a tiny bit smaller die. 1.99x2 to 2.35x2. I doubt the small increase in throw would be worth the effort to design a new 3v driver for it. Botton line, I dont think it would sell well. Maybe Lumintop can test the waters to see if people are interested.
ah okayā¦ was thinking since the ft03 is such a great thrower with that emitter maybe blf gt would be also but if not much difference between i guess not heheā¦
I highly doubt it, the SBT-90.2 is the next step for this series of lights.
totally understandā¦ another question, does lumintop still make the xhp35 or xhp70 version or is it sold out?
Last I knew they were still being sold, donāt see any reason they would stop selling them unless they ran out of stock.