This adapter for smartphone and the 8BitDo zero (1 or 2) gamepad , turns your phone into a retro gaming console with style. Enjoy the 30 year old GameBoy design with the latest in (emulation) gaming technology:

No spring or screw needed
Just need 3 rubber band and the 8BitDo zero gamepad

2 rubber bands are used to add a gripy texture to the phone holder part
1 rubber band is used to close the phone holder