"What is the type of screw used to attach the strap to the headset?"に関する回答It is a T6 torx 12 millimeter screw. Check out the Strap and Cable Replacement Guide for more information!
"How do you remove the screen from the lens cases?"に関する回答After removing screws from the screens, you can use an iFixit opening pick to safely detach the screens from the lens case. There is a groove along the screens and opposite from the lenses that you can pry open using the pick. There will be some resistance, but they will eventually come loose. There are additional instructions on how to open the screen in the Screen Removal Guide.