g4driver
Legend
The "P" is a thin plastic veneer glued onto the trap door. Use a narrow flathead screwdriver or similar and get below the entire cover and pop it off. It is ~1/10" - 1/8" thick
I used the wrong small screwdriver the first time and used an even smaller one and got it opened.
342 grams now - the frame felt nice but way too light for my taste. It feels much more stable and solid at 12.2 oz to me.