Nice find but I already have some thin nickel plated brass sticks.
my question was about the marks on positive driver pad caused by battery pole
I wanted fix it with a small solder blow from an alloy that does not form oxide and more hard than SN/PB.
Sounds like you want precious metals 
Trying to order from Sofirn but they ask for a lot. Can’t just use PayPal. Just gave up.
you could sweat solder a small piece of sheet silver on there instead, it`s a better material than gold (or anything else) even it`s oxide conducts as well! it`s also a soft metal. I replace all sorts of flashlight parts with pure silver, it`s worth getting some in (for everyone into repair and modding).
Thx for suggestion 
Will try Ag sheet if I find it
Yea by the time they charge shipping at Sofirn same price. I was thinking folks were getting the c01 for $4
yes, but you have to buy 6 to get the free shipping…
And how many of the co1s?
Tried 4 and got free shipping. Very confusing sight but hopefully smooth sailing from here.
Yeah if you notice up at the top of the Sofirn page, it says free shipping on orders over $21.
Not a bad deal….
Can’t find that notice but that’s what I needed to know.
It’s in the blue band at the top of the Sofirn page.
Looked again nope but now I know.
Fo run stock Led at ~40 mA max.
Jumper with solder blow the 220 resistor without remove it
or I have to change resistor with lower value like 10Ω ?
Is the silver version anodized silver or the unanodized version? Also how long are shipments taking to US lately.
There’s no silver C01. The silver C01S is not anodized.
Did LED (rngwn) and resistor mod today. I only had 0805 to hand but managed to squeeze them on. Tried stacking it on top of existing 220 but didn’t work for some reason, so ended up removing it as djozz suggested (loading it up with solder and launching it) and was easier than expected. These things are so tiny. Was (pleasantly) surprised 0805 fitted. Currently have 2300K with 331, 681 and 222 resistors to see which is best for a night stand. At first guess though, I’d say 331 is around 0.6 lumens, 681 around 0.5 lumens, 222 around 0.2 lumens.
I tried with diffuser but was still too bright. Intended use is as a night light for kids (0.5 lumens should be perfect), and for me when I need to go pee pee in the middle of night (I find 0.3 lumens too bright in these instances). I bought a few (too many!) so will leave some stock for general around the house use.