Hang the Projector on the Ceiling
1Loosely install the 6 mm knurled knobs, flat washers, and conical spacers to the 2 hinge pins on the base box (Figure 4).
spacer washer 
knurled knob 
slide projector
bracket here between
the base box and the spacer
FIGURE 4
Attach knurled knobs to the side of the base box
2Make sure your cables are pulled through the center hole of the base box, then carefully lift the projector and turn it upside down so the mounting plate faces the ceiling (Figure 5).
3Insert the projector and mounting bracket slots onto the base box hinge pins between the spacers and base box (Figure 4). Slide the projector bracket forward until the hinge pins rest fully in the vertical slots and support the projector.
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