Ball joints, systems in which they are used, and suspension systems in which the ball joint systems are employed. An attribute of the displayed graphical input region is changed so that inputs by the display selection device change for the same data input. According to the variable optical attenuator, when the mirror member is straightly moved by an actuator, light attenuation can be varied thereby. At least one adjustment assembly is disposed in interconnecting relation between the mounting assembly and the cover assembly, and is structured to selectively dispose said the cover assembly in any one of a plurality of operative positions relative to the mounting assembly and the various parts of the watercraft.