I agree with chalion. But I have not always been able to carefully get the LED housing out of the emitter of some of my Aeon/Dominix/Sentinel lines. Perhaps not long enough wiring or the wires are wrapped too tightly around the switch area. You could take a flashlight and have a good look from the pommel end. If everything looks okay... then take a long wooden/plastic stick like a chopstick along the opposite side of the switch and try to nudge the housing out of the emitter. Make sure not to get stuck or put pressure on the wires. This is for if the LED does not come out easily.
When tightening the base of the module do so gently with clean dry hands. Hope this works and if not you will need to first send an email to
customerservice@ultrasabers.com . You must clearly explain the problem and email at least one clear photo or short video. Will need the invoice # of your order so that the staff can look it up. It shouldn't take too long to get it fixed but ask them first as there is no guarantee that the saber will be returned by the date you would want to have it back.