I fixed a Yashica Lynx 1000 with aperture problems. Took the whole lens apart and found a bent diaphragmblade. The whole fix took me two days!
What a drag! Founding out what the positions are of the blades and the same thing with the shutterblades! Its a japanees made Compur Shutter, Beautiful!
At this moment I have to look at the slowtimes 1/8 to 1 sec They seem to be mixed up. Getting back in there today.