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Materials required: Highlighter marker cap (Standard sized highlighter) of ~0.54" OD

Tools required: grinder

Find a cap that is about 0.54" OD. Grind off enough material so that 2 notches about 0.1" wide remain. Keep trimming until it fits the adjustment bushings on the reflex sight.

If you break one cap, find another one. A whole pack of highlighters or markers can be bought for under $2 USD. It sure beats $28 or $50.
 
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