@fujiwood Messy at the start! https://www.reddit.com/r/flashlight/comments/171lkvk/first_messy_try_at_modding_wip/
Then, since I purchased the LED already soldered on a MCPCB, I desoldered the stock one, ground a bit the new one to fit, soldered the wires back on the new MCPCB and voilà. Changed the thermal paste too.
@Zak Thanks!