The Energon Pub

Ok, i know I've seen this issue brought up or atleast mentioned here and there on these forums... so is it the whole arm that sbackwards? Or is the Shoulder the only thing that needs to be replaced and switched around to fix the issue..are there any booby traps like with G-1 Prime shoulders?? meaning once I unscrew it, I won't be in shock from pieces flying at me.. and springs jumping at me..??