There’s a write up on swapping leds over at the other forum. Just look up ” Gerber Infinity mod step-by-step”. Its been several years since I modded mine, The head was really tough to get unscrewed but I didn’t add any heat to try to help loosen the loctite. If you get the head off the mod is really easy. Polishing the reflector hole helps too, while you have it apart.
These would make a pretty sweat swap in a infinity [1900k edition is in!] WTS: 1900k-5800k 5mm LED 95+ CRI