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Or you could replace the appropriate resistor already in series with the led on the pcb. No need to add another to the leg of the LED. Solder sucker's quite literally suck. Desolder braid is much more effective. Calculate the required resistor value (Google the formula or find one of the many calcs on the web 3v drop is a good ballpark for most LED). May as well learn to do things properly that way you can pass on more powerful knowledge to any fledgling modders out there.