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Permanent Polar scope Reticle Centring


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Has anyone done something similar to what was discussed in this post ?. Basically use the appropriate O-ring for self-centering of the piece that contains the screen-printed reticle of the polar finder in its housing. Does anyone know the exact size of the o-ring?. Does anyone who has disassembled the reticle know if the piece of methacrylate or glass where it is printed, fits exactly in the piece that contains it, or has some slack?

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