Ok so I got MP Megs on Saturday, turned him into gun mode on Sunday without any real problems and now I'm trying to turn him back but just cannot seem to get the chest to expand out. See in the picture how it should pull out further to expose his yellow waist and make the red bits move onto his sides? It's stuck and won't budge. I'm trying to pull it upwards and it feels like I'm going to break him. Any help?