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For those who bought diopters.
Please note in the instructions that they say NOT to install the lock nut on the Iris thread. Reason? Seriously cuts into the amount of adjustment possible.
Just use a low value Locktite or substitute, rough equivalent to the blue, 242, or lower strength version. Remove iris from sight, drop the Locktite onto the start of the threads and screw in until it hits the end of the threads in the iris block on the sight.