Introduction
The diopter is unable to be calibrated, creating an optimal focus issue for the users to match their eyesight.
Tools
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            Place each of your thumbs on the interior portions of the eyepiece cup, pressing down and pushing up. 
 
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            Remove the diopter with your hands. If the diopter is at all stuck you can use the pointed tweezers to help aid in the removal process. 
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.