Help repairing Voigtlander vito CSR

Hi,
I'm new in the world of analog cameras and I recently acquired a voigtlander vito csr. The viewer is full something I believe is dust. The problem I'm having is that I can't remove the top plate because I don't know how to remove the rewinding knob (there aren't any screws on this part). Do you know how to remove it? I've found some repair manuals of a vito CLR but it didn't explain how to remove that.

Thank you very much!!

Here's a sort of generic look at that. Most cameras have the same setup on this (I think).
https://www.google.com/search?q=how...AHzAZIBAzAuMpgBAKABAcgBCMABAQ&sclient=gws-wiz

momus said:

Here's a sort of generic look at that. Most cameras have the same setup on this (I think).
https://www.google.com/search?q=how...AHzAZIBAzAuMpgBAKABAcgBCMABAQ&sclient=gws-wiz

Click to expand...

I've tried that and it doesn't move. I'm scared of applying too much force and breaking it.