FOCA 2star shutter adjustment - need help

almost

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Apr 27, 2016
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Hello,

I have this lovely Foca 2 star, with a pefect Oplar f1.9 50mm lens. The faster shutter speeds are ok, but the 1/50 and 1/25 and also the B are a bit sluggish. the first curtain opens slowly i think.
Looking at the bottom of the camera there are two screws (on the side of the film roll) and 1 screw on the take up spool side. I am pretty sure that these screws adjust the shutter but do not know what does what and in what sequence they need to be used.
I have messed up a russian shutter in the past by adjusting screws without knowledge and i do not want to do this again.
can any one help please?
I will try to post an image below
 
Foca-Baseplate-web_zpsyoijesl4.jpg
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I have messed up a russian shutter in the past by adjusting screws without knowledge
What fraction of your pictures would be impacted?
What are the chances that the shutter ends up being worse after attempted adjustment?
What if it's not just a matter of adjustment, but dried lubricants?
How about using it as-is?
 
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