The Dual Screen addon blocks the power / volume buttons when used with the Retroid Pocket Mini, this is a janky fix.

Can't really think of a way to have the volume-up button as stable as the other two, and honestly the power button was the only one I wanted.

The buttons can be installed while the screen is installed, just put the volume-up button in last. It shouldn't fall out very easily but I don't know how vigorously you shake your Mini when gaming.

Hopefully these won't scratch your device or cause your screen clamp to crack but if it does I'm not responsible!