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This is a power button for Gideon's Ultimate64 main board when installed in a 64c case. This part slides over the factory pushbutton that's mounted on the board, and fills the opening in the case, giving you a more substantial power button. Simply slide it onto the switch on the board before installing the board in the case. Attach the screws as normal and you're done.
This part was designed on the v1.2 board.
Check out our other Ultimate64 parts (Keyboard brackets, Power Plates, Power Buttons, Userport Cover and mainboard support) in our Shapeways shop.