EOTech CNVD-T2 Clip-On Night Vision Device - Thermal 2 - Manual (Page 62)

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3.3 CORRECTIVE MAINTENANCE (Continued)
5. Replace the battery cap and/or battery cap lanyard as
necessary.
6. Stretch smaller eye of the battery cap lanyard over the
post on the battery cap.
7. Simultaneously stretch and pull the larger eye of the
battery cap lanyard over the battery cap threads. Work
the lanyard until it is seated neatly in the groove closest to
the CNVD-T2 housing.
8. Stretch the o-ring over the battery compartment threads
and slip it into its retaining groove.
9. Reinstall the battery cap and tighten.