This week I broke down and got the 20th Optimus Prime. I already have both MP1 and MP4 but would like one to actually play and leave around the house. For some reason, I can't slide his legs up in the truck cab mode. I keep pressing the release side tank barrels on the side of the legs but it won't trigger the sliding mechanism. Anybody have any suggestions? I'm so frustrated that I might get a hammer or something.