For anyone with my VERY specific use case.
If you happen to use: Sony ZV-1 camera, SmallRig Cage and dummy battery you might got annoyed that there is no way to protect battery door without filing camera body or disassembling the door entirely. This plug comes to the rescue.
It holds battery door at an angle that allows for dummy battery cable to still exit the compartment and sits flush with cage itself so there is no way to accidentally damage the battery door.
It might hold on its own but better to secure it with a thumbscrew.
The author marked this model as their own original creation.