OverviewThe eyepiece locking ring is the part that makes your focus setting stick. A ring that is worn, or that has been tightened past its limit, stops gripping, and the symptom is that the eyepiece will not hold a setting. Replacing the ring restores the lock. It is a bench-level swap — set eyepiece focus again afterwards and lock it down.Key Features1) Locks the eyepiece where you set it so focus does not drift during use and vibration;2) Direct replacement for a ring that has been over-tightened or worn until it no longer grips;3) Fits the eyepiece on ARGUS BNVD-1431 MK2 monocular housings, and on MK3 and MK4 housings;4) Cures an eyepiece that backs itself out and will not stay in focus;What's in the BoxOne eyepiece locking ringHow to Operate1) Back the worn ring off the eyepiece and lift it clear;2) Run the new ring on by hand and leave it loose;3) With the unit switched on, set eyepiece focus for your own eye;4) Hold the eyepiece at that setting and bring the ring down against it until the setting holds;5) Handle the unit and re-check — the eyepiece should stay where you left it;CompatibilityARGUS BNVD-1431 MK2 and PVS-14 pattern monocular housings; also fits MK3 and MK4 housings.Why the ARGUS PartThe check is simple: set eyepiece focus, lock the ring, then handle the unit and look again. If the setting has moved, the ring is no longer gripping and wants replacing.The same ring fits MK2, MK3 and MK4 housings, so one spare covers a bench running more than one of them. Shipping note: this item currently cannot be shipped to Japan or Taiwan.
