Hey Mark, the arm comes off of the arm collar which is mounted to the armboard. The allen key for it is on the right side as you are looking at the arm from the front. There also is a set screrw that may or may not be used to hold the arm cable in the arm. On the right side (looking form the front)is a tiny allen screw inset in the arm post. If you pull and feel a lot of resistance it is probably tightened. The armboard unscrews by 3 screws from the underside. You must take the armboard off or it will be forcibly removed in shipping and you will need to buy a new one. Depending on how old the packaging is the dust cover normally sits in the top piece of styrofoam, there is an indention for it.