I just got a few Flathead screwdrivers small. I pried it apart starting at the top right next to the clear red plastic piece. I did have to break some of the plastic under the battery cover because there were no good pry points in that area and to much glue. It broke half way in the battery circle but once I did that I could fit the circuit board in. When you put the key in there is a spring you have to wind to get the key to flip open but other than that I just put little drops of super glue here and there and you really can't tell it had been broken under the battery cover.