The Luke ROTJ is very easy to take apart. Peel the sticker off the control box. Remove the screws. Take the top copper part off. Cut the wires to the switch or unsolder them. Remove the control box. Now, remove the plastic sleeve in the bottom of the hilt. It is very lightly glued in place. Put two fingers in and twist it back and forth. It should come out. Now you will remove the blade and electronics. There is a small plastic nub that holds everything inside. On some you can grab the blade, twist back and forth and you will feel the nub give way. Others you may have to hod the blade and give it a firm jab downward on a rolled up towel. Your basicaly applying force to break the nub. Don't worry, the nub will let go before anything else does. The blade and electronics will now slide out the bottom of the hilt.
