I ordered there because DB Customs mentioned this seller, but several messages later in the Q8 thread TOM E wrote that he was not happy with the screws from this seller:
https://budgetlightforum.com/t/-/39069/15348
I cancelled my first order and ordered again from “superiorsell2014”.
EDIT: It took me several minutes to find the messages (links), in the meantime TOM E was faster. 
Ohh - turns out the sellers that even charge more $$$ are selling the same exact screws - oily and the 2.5's have cracks in the heads. I feel a little bad bout it, but left negative feedback, then they offer a full refund if you change the feedback to positive - but actually, the seller is helpful in this regard, so my positive feedback is all bout the seller, not the product.
Yeah I can also report what looks like cracking from some of the brass screw sellers. The larger ones for the reflector seem to be fine. I just wiped all mine off heavily before using, wonder why the oil?
In my approximating shoebox I hit 7025~ turn on 6500~ 30sec on my Q8 first batch no swapped wires or fet, just spring bypasses and some TLC. I’ve been itching to swap the LEDs, but I think I will wait on a way to natively use the Luxeon Vs without scuffing up the nice stock Q8 mcpcb.
Can someone write all screw sizes for first batch and second batch (I believe there is difference)?
I just done spring bypass with 22AWG wires but I left in the small springs too.
My output was 5400 lumens. Now I got 6870 lumens.
Thank you.
Ok, so second batch is:
driver: M2.5x4mm *2
tail pcb: M2.5x5mm *4
reflector: M4x10mm *1
mcpcb: M2.5x10mm *2
someone please add first batch info
Fisrt batch is (if I remember correctly):
driver: M3x5mm *2 (countersunk)
tail pcb: M2.5x5mm *4 (countersunk)
reflector: M4x8mm *1 (pan)
mcpcb: I dont know, I did not take them out, may be M2.5x5 *2 (pan)
Can someone confirm sizes, I plan to order some screws?
3X? I just got the 2.5x5’s, used them on the driver and tail pcb. No real need to take it further than that. Worked fine with my XP-L2 light up to 10,212 lumens so I suppose that’d do for most anything.
My feeling is that you have to work on your calibration (for this colour temperature) or integration quality Dale, 2500lm/led is about the max for a bare W2 (calculated from Texas Ace’s calibration, measured on a 5000K led), that is without optics and lens losses.
What you got is bout as good as it gets. Batch 1's are all over the place - some clearly cut down, so on some, M2.5 x 4mm are used or cut down as low as 3mm lengths. There's variations in threaded hole depths, etc. Batch 2 are way more predictable.
Today I'm getting my batch 2 brass replacement screws: M4x10mm and M2.5x10mm 
.
Someone asked earlier about the oil - the oil is from the machining process. Normally it's cleaned off before shipped out but at these cut rate prices, the cleaning step is skipped. If you've seen episodes of "How It's Made", cutting, machining, drilling metal is usually accompanied by high amounts of oil, called "cutting oil". Not sure if I'm right on this, but I think it prolongs the life of the cutting instruments, makes the cuts easier and smoother, etc. I use it myself all the time now with my bench drill press when drilling or machining aluminum, brass or copper. Definitely improves the speed and smoothness for me.
Thank you all :+1:
Let’s have it all at one place 
The Miller you can add it to first post if you want.
First batch (if I’m right):
driver: M3×5mm *2
tail pcb: M2.5×5mm *4
reflector: M4×8mm *1
mcpcb: M2.5×5mm *2
Second batch:
driver: M2.5×4mm *2
tail pcb: M2.5×5mm *4
reflector: M4×10mm *1
mcpcb: M2.5×10mm *2
DB Custom
I know there is no gain in replacing other screws, but they have damaged heads so I would like replace it
Today I got my 2.5 mm brass screws delivered (very fast 11 days shipping), but also disappointing cracks in the screw heads.
Would you go the negative feedback route?
My 2nd batch tail pcb screws are M2.5 x 6 mm including head.
Ask for new screws , or refund . Seller is just a seller , and not the factory that made them (and had QC issues).
XP-L2 and XP-L W2 are different creatures. I have both, they are obviously different. The XP-L2 is along the lines of the XP-G3, the inverted die with no bond wires. The XP-L W2 has visible bond wires and the dots on the phosphor not seen on the XP-L2.
I was as surprised as anyone to see that 10,212 lumens, believe me!
When I re-flowed the XP-L2’s onto the Q8 MCPCB I didn’t realize the thermal pad was sunken. I didn’t add solder paste so I ended up overheating the LED’s. I think that’s why I am now “only” seeing 8728 lumens instead of the 10,212. If I’d had more of the XP-L2’s I would have used new ones again after I cleaned the MCPCB and used a solder paste mask to get the right re-flow. I re-used the LED’s that had started glitching, and here I am.
Now running bistro-HD on my Q8. Actually have been on and off for awhile, but now sharing a working version:
https://budgetlightforum.com/t/-/44344
It runs fine. Long click off, no new e-switch specific features yet like on-press shortcuts or lockout. Not that it matters for the Q8, but it fits on an attiny25 still. Download includes precompiled hex and click to compile and click to flash scripts.