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+[* red] Three screws (red circles, shown here already removed) hold the ring surrounding the rear lens element.
+[* black] With the ring removed, you can gently lift up the spring mounted rear element (yellow circle) with tweezers. I was then able to clean out the offending dust on the back of the element.
+[* black] Time to reassemble everything (again!) - this time, everything worked fine AND no more dust spots in the images. Success!

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