I have the Vitessa L with the barn doors. I've heard the suggestion that one hold a finger on the wind plunger when releasing it to the "ready" position to avoid shocking the mechanism, which is complex, read expensive to repair. Prepare for a shock if the rangefinder needs work, I gather that the top has to be reinstalled after each little adjustment. There was probably a jig for the factory assembly, some repair shop in Germany might have one.... A fun camera and a piece of history. Wish I had a '55 T-Bird to go with it!