NEC NP1150 - XGA LCD Projector User Manual page 148

Install the new lens
1. Insert the lens with the yellow protrusion on top.
2. Rotate the lens clockwise.
Rotate the lens until you feel it click into place.
Using the anti-theft screw to prevent theft of the lens
Tighten the supplied anti-theft screw on the front bottom.
hole of anti-theft screw for lens unit
34
8. Using Optional Lenses
Yellow
Protrusion