A case for the SukkoPera's openC64cart (8k and 16k). Find the hardware repository here:
OpenC64Cart
OpenC64Cart 16k
The case has a removable lid and three sort of plungers for the reset key, depending on the height of the tact switch.
When the lid is closed, it is required to make sure, that the reset plunger is clicking, when it is pressed. In the worst case, it is constantly pushing the reset button, which will prevent the C64 from starting.