Disassembly | Halo Energy Sword by Mattel NeoPixel Upgrade
With the glue removed, you should be able to remove the bracket from inside the blade. Do this slowly and pull it out, little by little. Once the bracket is outside of the blade, pull out the inner plate. This features a mounting bit that contains the LEDs. Tip: You can pull apart the sides of the blade to allow the mounting bracket to come out.