This was my first attempt to add a LED to a figure to give it light-up eyes.  I swapped Skeletor's torso for He-Man's because He-Man has more room to hold batteries, wiring, and the circuit board from the Deluxe Battle Sound Skeletor that I used.  An interesting side note is that, because I apparently wired the light into the spot that once was connected to the speaker on the circuit board, the eyes pulse in time with the voice clip stored on the circuit board.