When you unscrew the top, the lens should be pushing up by a spring from the bottom. Same as the one on the side. If possible , unscrew both of them. But be aware of a little spring and metal ball for click use if having one, don't drop them. Now you may try to use a pin to push inside see if you are able to push the len in, when release the pin, the len should be spring back out. If it is not moving , that could be stuck or something. Let's see what you could find out. Good luck.
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