Leica IIIf Viewfinder Problem

[blaised]

I was having problems with the Rangefinder so I decided to remove the eyepiece and have a look. I wasn't able to fix it, but I messed up the Viewfinder somehow. Before the Viewfinder was clear and now it is completely out of focus. I did not do anything to the Viewfinder.

I know this is very difficult, but can anyone help?

Thank you in advance.