I just got Grimlock in the mail today and the backwards shoulders bothered me, so I knocked out the pins and swapped them. I also reversed the black tabs and they do keep the shoulders in place better now... Sorry about the crappy picture Oh and I noticed when doing this mod... The screws where really tight and harder to remove than normal, and when I re-assembled it on the correct side the screws went easily. So I believe this is how it was intended to be in the first place.