Night Optics Falcon 6x Gen 3 Gated Long-Range Night Vision Binocular - Manual (Page 99)

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2-20 INSTALLATION OF 3X MAGNIFIER
The 3X magnifier can be threaded directly into the objective lens,
with the LIF removed. It can also be threaded into the focus ring
adapter and slipped on over the end of the objective lens with the
LIF installed.
Figures 2-26 and 2-27 illustrate these installation procedures.
NOTE
The tethering cord can be used to tether the 3X
magnifier to your person to prevent losing the lens
if it is dropped. To use the tethering cord, tie the
end without the clip tightly around the 3X magnifier
and attach the clip to a button hole, belt loop or
other convenient point.