Not sure if this is what you mean... This is what the Brute's shoulders typically (or officially) look like, with Onslaught's fist up top. There's a slot near the combiner port and a tab on the chest armor that holds it together, making it a very solid configuration for articulation. But you can rotate it backwards so the wheel faces forwards. The port can still be used (and is now accessed from the top, meaning you don't have to open and close the chest plate every time you want to switch limbs) and the chest plate still closes all the way even if it doesn't lock. This gives him a sleeker profie up top without the awkward shoulder pillars, even if it does reduce stability and add a little visible kibble on either side of the chest.