Improvements are provided for hubs for wall mounting systems for screens, and in particular to a hub for a wall mounting system for a flat panel screen, such as a plasma display or television screen, which enables the screen to be tilted. The hub comprises a casing, means for attaching the hub to a screen bracket, means for attaching the hub to an arm of a wall mount, and a tilt member. The tilt member has a sliding member which is located within an arcuate cavity in the casing such that the sliding member and casing are slidable relative to each other to enable a screen attached to the mounting system to be tilted about a horizontal pivot axis. The arc is defined by the cavity having its centre, which forms the pivot axis; offset from the centre of gravity of the screen. The hub further comprises a compression spring located within the casing and biased to provide a counterbalancing force so that the screen remains stationery in any position.