I am in the process of completing my first CLA of a shutter & aperture. The lens is a Compur-Rapid Jena Tessar 2.8 from a Zeiss Ikonta B. I am sure it is just my lack of experience but an issue has surfaced.
The shutter will not fully open when set to the "B" position. I have included 3 images of the partially disassembled mechanism. One with the shutter closed. One with the shutter as far open as it goes when shutter actuating lever is pushed. One while holding the shutter fully open. Note the white arrows which indicate the difference between how far the arm will push open the shutter & how much further it needs to travel to be fully open. This part was functioning correctly before I started. Need suggestions as to what might be occurring.
I have had the actuating lever & its attached spring loaded arm disassembled. My reassembly might be in wrong but I do not see how. I can manually move the lever attached to the bottom of the case which easily & completely opens the shutter fully so the shutter its self is not binding. Also you may notice that the booster spring seems out of place in some of the pictures. This is only the case for the photos, not when attempting to actually open the shutter.
A second clue to note is that after putting the shutter back together for testing, I also noticed that when releasing the shutter at all speeds, the mechanism would not return as it should. It would have to be pushed back because of what appeared to be a slight binding or rubbing. Could not tell where this was occurring either when the unit was together or after removing the face or speed ring again.