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For anyone who owns the Iron Factory/Pocket Toys Bruticus, allow me to share with you some novel information that I discovered. You use a Lego 2x2 turntable to add a swivel to the big guns on Onslaught's vehicle mode. Now he can shoot at things that aren't directly in front of him and his trailer can turn like a trailer should. If you don't mind a bit of heresy, you can trim down the length of the pegs on the underside of the gun to make the connection a little cleaner, which is what I did, but it's not at all necessary.
Sometimes my genius frightens me.