For use loosen the screws that hold the E-Z Lock Clamps to the tray. This allows the clamps to be adjusted to the WIDTH of the arm pads. The long slots in the clamps allow for considerable adjustment. Slide the clamp assemblies to the widest position on the tray. Using Allen wrench provided, loosen Adjustment Bolt so the Cam on both E-Z Lock Clamps easily slide up and down in the Adjustment Notch slide. Move the Cams down to the lowest position. Place the tray onto the armrests from the front.