Removing Magnifing Glass from PUK III

Hello,

I recently bought a close-out PUK III and while talking to the tech
to set it up; he mentioned that many jewelers had removed the
magnifying lens so that they could use their Optiviors instead of
the PUK’s set magnifier. Can anyone tell me how to do that? It looks
like the lenses are set securely in a snap together (after taking
off 2 screws) fixture. But, I’m not sure what part is a snap off and
what part is a break off.

If anyone can point me in the right direction, I would really
appreciate it.

Thank you!
Jaynemarie Crawford