There are two types of PlugIt cords in the US due to different wire gauges. If you look at the one for the 1400, it does not have a key on the PlugIt end whereas your smaller sander's PlugIt does. The sander has a smaller wire gauge that can't be used with higher-draw tools like the OF-1400 so they put the key there so you can't insert the smaller gauge PlugIt into the OF-1400. If you use a boom arm, put the larger gauge PlugIt on it.