272-62.7 Sacrificial Window Installation:Perform the following procedure to install the sacrificialwindow onto the objective lens assembly.CAUTIONIF ADVERSE OPERATING CONDITIONS(BLOWING DUST OR SAND) ARE EXPECTEDTO EXIST, ATTACH THE SACRIFICIALWINDOWTOPROTECTTHEOBJECTIVELENSFROM SCRATCHES OR OTHER DAMAGE.1. If the objective lens cap is in place, remove it.2. Carefully push the sacrificial window into the objectivelens with the sacrificial window threads facing toward themonocular.3. Securely screw the sacrificial window into the lens until itseats.Figure 2-5 Sacrificial Window Installation