After removing the middle screw, I was now at a loss of which direction to go next. The earpiece was still firmly connected to the mysterious red chamber, and I didn't see a logical next step except to simply pull the two sections apart.

The slots in the speaker enclosure allowed the rubber to hold on to the speaker enclosure. I began forcing them out of their place to hopefully allow access to the other side.

With all rubber nubs removed, I could finally see inside the rubber area - Finally! The 4 screws holding the frame pieces together could be taken off!