So. I've got the Masterpiece Skywarp, and the Masterpiece Greenscream (currently in the beauty parlor for a Thundercracker makeover) and in the process of taking him apart, I noticed something strange. If you look at the edge of the shoulder on the Masterpiece Skywarp or Starscream figures, there's a little plastic bit, a pivoting socket that doesn't seem to attach to anything or serve any purpose I can ascertain. Turned one way. Turned the other way. I'm assuming it's there on the USA MP:SS, though I haven't got one yet to see. The question is, does anyone know what this is FOR? Does it serve some obscure purpose in transformation that I have somehow missed, or is it maybe for some sort of accessory or other undocumented feature? I'm going to go dig out the boxes and check the manuals, but if anyone has a quick answer, by all means, please share!