CABLE TENSIONING SYSTEM AND DIAL

There is provided a head-mountable electronic device, comprising: a display; a housing connected to the display; a strap connected to the housing; and an adjustable headband connected to the strap, the adjustable headband comprising: a band; a cable connected to the band; and a tensioning system connected to the band and the cable, the tensioning system comprising: a dial housing; a cam wheel in the dial housing, the cam wheel including a ramped surface defining a roller opening; a dial wheel including a protrusion extending into the roller opening; and a roller disposed in the roller opening adjacent the protrusion and between the ramped surface and the dial housing, the ramped surface being inclined relative to a line tangential to a point on the dial housing in contact with the roller.