I'm trying to swap a L-L Erie Built shell onto a new chassis that's had a decoder installed (I don't have the skills to do a hard wired install myself, but got luck on eBay). I also need to swap the trucks or the truck frames, as they're not the same color between the two chassis. I can't for the life of me figure out how to get the trucks out or the frames off short of entirely disassembling the loco. Does anyone have any tips?