Owner of this specific D4S said Hank custom made for him. However, when I e-mail Hank about the custom aux LEDs D4s, he replies “I’m afraid we are not able to offer such option.”
May it is just for China customer or for Hank’s group members only.
The aux LED board uses some common cheap LEDs and they shouldn’t be incredibly difficult to swap out. It’ll be useful to have hot air or a wide solder tip for unsoldering the stock LEDs though.
It looks like it uses the same type of LEDs as several of the clock kits floating around lately. I don’t know what type they are, but they can put out a lot more light than what the D4S does with them.
These LEDs don’t have much metal to grab onto, so I’m not sure the 2-iron method would work unless you have a third hand to grab the LED from the sides at the same time. That method works with resistors and capacitors, which typically have a metal surface to press the iron against, but I haven’t found these to work that way.
Putting them on the board is easy, but getting them off without destroying them is difficult.
This pic, when zoomed in, might show enough to explain why:
The great thing about this design is that the secondaries are all on their own little separate board. So you pull the board out of the light, toss it on a hot plate/stovetop/frying pan/whatever, heat gently, then when the solder flows you just flick every one of those things right off. They look like 0805’s to me, same ones many of us use to build lighted tailcaps, so pretty easy to find in lots of colors to drop back on.
Obviously you’ll have to work kinda quick and watch your heat or you’ll be burning the mask off of the board, but I don’t expect it to be a very hard mod at all.