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Be sure to use the lock washers. Tighten but do not over tighten the screws. 5. Thread the projector mount onto the knuckle assembly (mounted on the ceiling mount) and spin the projector until it is tight. Spin the projector up to one more complete turn until it is facing the correct direction and the allen nut is also facing the screen. Turn the projector on and horizontally and vertically adjust the projector until the image fills the screen. Tighten the knuckle assembly with the allen wre