NX 300 battery lid replacement?

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Astronaut

NX 300 battery lid replacement?

Hi,

 

the battery lid for my NX 300 doesn't close anymore, so I got an new original replacement lid. Problem is, I just cannot figure out how to replace it. Does anyone here know how to take out the old lid and put a new one it? It is fixed with a small bolt and a spring and with some other Samsung cameras you just kinda flip it out with some force but it doesn't seem to work with this model. I also tried to unscrew the base frame but it was not successfull. Help is much appreciated. Thanks.