I had a Zenit 12XP briefly. It made a horrible squeal when I advanced the shutter and the shutter curtain only worked about half the time. I wish it worked half

I had a Zenit 12XP briefly. It made a horrible squeal when I advanced the shutter and the shutter curtain only worked about half the time. I wish it worked half as well as the author's cameras did. I'm much happier with my ca. 1960s Nikon SLR.