I am looking to get inside leader prime's chest and get access to the wiring. I am able to get to 3 screws on his right side. the last screw is behind a pin joint for his arm. I thought about removing the pin but the battery pack is in the way. I have seen no way to remove the battery pack. Any ideas. i have some LED mods i would like to try but need to get inside to try them. Thanks in advance.