Several years ago my Plaubel Makina 67's light meter died.
I had it expertly repaired at Nippon Photo Clinic Service, 920 Broadway At East 21st St., New York, NY 10001
Phone: 212-982-3177
The staff was all Japanese and they specialized in exotic Japanese cameras.
I have no connection to them and I'm not even sure that they still can do that type of repair.