Has anyone had any success in taking apart a Classics Megatron? I have a United Megatron that is having issues with his right arm properly locking into place in bot mode. I'd like to replace the part that stands flush against his torso and joins his right arm to his body, and I picked up a Classics Megatron to use for just this purpose, but holy heck - this figure is not meant to come apart, is it? Any advice? Or should I just forget about this?