How to change/replace lenses
Juliet, X-Metal XX, Penny & X-Squared
First, remove the orbital screw by using a T6 screw driver.
Be careful not to loose the rubber gasket.
Remove the lens from the frame by holding the lower part and open wider by hand and push it out slowly.
To install a new lens, follow a similar process.
Put the nose part of the lens first and slowly pushing a lens in.
After installing the lens to the frame, put the rubber gasket between the frame and start screwing the frame by a T6 screw driver.
The process and pictures are only Juliet.
However, for Penny, X-Squared and X-Metal XX, you can change the lenses with same process.