[. . . ] Failure to do so could result in excessive projector vibration or falling from the wall or ceiling causing damage and injury. [. . . ] Failure to do so could result in excessive projector vibration or falling from the wall or ceiling causing damage and injury. Injury and damage can result from dropping or mishandling the projector. Getting the projector ready · The wall or ceiling structure must be capable of supporting at least five (5) times the weight of projector. Tighten the remaining two tension knurl knob (2) until the mount becomes rigid. With the projector secured in the mount and power on and signal supplied to the projector you can now proceed with the final height, tilt, roll and yaw adjustments to optimize the projector image. To install the projector lowered from the ceiling or on a wall, order the L1757A extension arm. [. . . ] With the projector secured in the mount and power on and signal supplied to the projector you can now proceed with the final height, tilt, roll and yaw adjustments to optimize the projector image. [. . . ]