Cleaning & Lubing a Leitz BL Finder

raydm6

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Posted this on p.net but got no responses. Maybe someone here can help. Thanks in advance.

I recently purchased a mint Leitz 135mm BL finder (SHOOC) and a mint 90mm BL finder (SGVOO) and have a service question.
The parallex correction ring on the SHOOC feels very good and rotates nicely, but on the SGVOO, it is very sticky and needs to be cleaned and lubricated. I am wondering if anyone has ever personally serviced/popped open one of these?

The are three small screws on the knurled ring (one shown in the pic). Is there a gear or helical inside? I'm afraid of popping this open and have stuff falling out :-(

Besides these finders, I also have a mint late version SBOOI on my IIIf and enjoy them tremendously. They are little gems and are a joy to look through.


3261345166_ee4b9be0a1_o.jpg
 
Sorry for reviving an old thread.

I have a SGVOO 9cm finder with tilted framelines, in fact its almost 90degrees tilted. Any advise on the disassembly process?

Thank you in advance!
 
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