Where did you get that A20 with no strobes?
Anyone found XMLs in 14mm star in DX, KD or so?
Mine has strobe ... Good thing about the original driver is it starts on high ...
Hi-med-lo-strobe-sos .. turn the light off from lo and then restart in high , if you wish ...
Or you can try a after market driver ...
Oh.. don't you know if a 17mm driver would fit? It would be interesting to make a really pocket rocket with the NANJG 2800mA .. http://budgetlightforum.cz.cc/node/1101
It would also need IMR 16340 or something that can hold that amperage..
It uses a 17mm driver ...
Im currently using a Solarforce V2 RCR123A ...[ Blue and White = new one ]
Previously I have used the Trustfire Flame RCR123A
You can get them from Cutter Electronics. They have some shipping though.
KD has bare PCB's to mount an XM-L on. You'll need to reflow solder the emitter to the board. Some youtube videos show you can do this even with an electric grill :)
From cutter: 9usd (the led) + 11usd of shipping.. :/
I think I will get one from KD in 16mm star and try to cut 1mm of the edges to fit the A20 dropin.. what do you think about doing this?
Shipping isn't much of a problem if you buy in quantities. You can even buy 13 x 14mm T6 Led in several tint options for $107 inc. shipping, which makes $8.2 each. In case of building a 5x XML setup I believe I could buy in such quantities. But it isn't that good an idea for just a couple of leds.
16mm ones might not file down that well. Maybe just 15mm or so. The pads are too close to the borders and I don't know if they would short if they shared the same border with the alu base. (EDIT: doesn't seem to short so I guess you can file it down) But still there can be some way you can make a smaller star. You can cut the PCB roads, remove the isolator on them and solder directly to these. Never tried though. But I believe I've seen one application, filing down to even a smaller diameter (~8-10mm) and putting the led on a pole to get a better focus.
EDIT: Ah, I found the link to this application.
Well, I think it wont be an easy work, but it seems to be possible, and I will have to do it because I bought it before asking :P
Considering my bad luck with shipping times, I will have it in two or three months, and I didn't buy the UF A20 yet due to Chinese Spring Holidays (one of these days I will). So, when I receive everything I will tell you.
$20USD for one emitter ?
Geez , there were some 14mm on Ebay .. But didnt see any a moment ago ..
T5 leds are much cheaper in Cutter, and further the price drops at quantity above 10. Not a bad source at all for multi led projects or if you are bound to 14mm boards. XP-G's are much expensive, that I can't understand why.
Good mod, Rich. Can you post some wall beamshots? Not one by one, but all those lights in a row, to see which one is brighter (and to compare beams patterns) 
Thanks.
Old, do you remember how did you modified the reflector to not shortcircuit the contacts?
I'm modding this light with a XML and a 2,8A multimode driver, and already connected everything, but I dont know how to fit the reflector well.. have you grinded something? which part?
Not a question asked to me but I guess I can share my solution.
I use some high temperature tape like this. I cut this is small slices and cover every area that may touch the emitter or the star. It endures high temperature rates an emitter can rise to, has a low profile so doesn't affect focus and easy to work with where standard 18mm insulators don't work.
Thank you Kokopelli! but I still have the problem that XRE are very protruded from the star, and leave a lot of space to contacts. XML doesn't, so I think I need to modify the base of the reflector in some way so it can fit and focus well.
I've had the same problem when I replaced an XRE for an XPG in another light. I modified the reflector but it didn't fit well enough.
And then I will need that tape, or something like that.
I hope to explain myself :P
This was the answer to your first question. No need to worry for shorts if you cover the contacts with this tape. This tape sticks really well.
But now I understand your second question better. XM-L has the same form factor of an XR-E thinking of the hole diameter but XR-E definitely protrudes further. Using less solder on the star, having lower profile cables may help you getting closer to the star but reflector may prevent this if it has some edge. Then, there is only one way to bring things closer, sanding or filing. But anyway, XM-L can't shoot far in a realy tiny reflector so you can also rest with what's in your hand. I made a XP-G light out of an A10B and it seemed to sit well on the base, though it didn't shoot that well due to emitters wider angle.
I have some thick tape , which I put on the bottom of the reflector , this stops any shorts .
Also I added some spacers to the base , which stop the reflector from crushing the wires , I used a fiber washer , cut into 1/4 pieces , then superglued down .