Sega MARIO & SONIC AT THE RIO 2016 OLYMPIC GAMES Owner's Service Manual page 71

4
Rotate the Switch 45 degrees counterclockwise. Unlock and remove.
10
5
Unscrew the plastic nut from the base of the button and remove.
6
Squeeze both tabs towards the centre of the button housing and remove.
7
Once the button has been replaced, follow Steps 2 to 6 in reverse order to reassemble.
58
Switch
Nut
Washer
Button
Tabs