Cleaning a 35mm finder

[varjag]

I have that Russian F=3.5 cm accessory viewfinder that accompanied my Jupiter-12. It apparently seen some use, with plenty of dust settled inside the assembly. Is there any way to take it apart and clean? There seem to be no screws or fixators on the exterior.

 

[fraley]

I was wondering the same thing. I think it's glued together. I tried twisting it and there is no give. Don't want to force it and break the bakelite part...

 

[DaveP]

Hello,
That inner ring in the eyepiece end of it screws out. I twisted the front off as mine was lightly glued. I cant remember, but I think if you screw the rear ring out then remove the eye piece, you might be able to clean the back of the front element from there and not have to remove the front........good luck