That is final disassembly point which can be easily done. Assemble lens back in reversive order.

However if you very much need to have access under the rear glass module the extreme challenge is starting at this point. I had to remove large 1.5mm wide dust particle, so I didn’t find other options but spend about 30 minutes accurately cutting out white factory glue piece by piece.

It’s very messy process generating tons of glue particles. After finishing that I also used very thin flat screwdriver to apply additional pressure between rear module plastic frame and lens core cylinder. Rotating rear lens frame about 15 degrees CCW allows to remove it.