...As a last-ditch effort, Leica re-released the M4. It was to be built in Midland. This time the camera was to use cheaper materials and less exacting methods of construction. ...
Not a good characterization of the manufacturing difference between the M4 and the M4-2. The M4 was manufactured the old way that all cameras from the high end manufacturers had done from the 1920s to the 1950s, which was very labor, skills, and materials intensive, translating to lots of cost and lack of profitability in the post-WWII era in the face of more efficient manufacturing processes, innovated by the Japanese manufacturers. The M4-2 was re-designed to be manufactured with more modern production techniques, where many assemblies were simplified and made easier to fit and tune to finish specifications, less redundant bits have to be kept in stock to aid adjustment and fitting, and fewer hours per unit need to be expended to complete the assembly.
This does not mean "cheaper materials and less exacting methods of construction." It means better process, better control of process variance (aka: *more* exacting methods of construction) which require less labor and hand adjustment of individual components. It also means more serviceable and maintainable cameras.
The first of the M4-2 bodies (there were three production runs) had some issues ... but the issues have little to do with the materials and how 'exacting' the method of construction were, they have to do with the usual issues of bringing up a new production line along with the usual issues of laying out a whole new production process, in a new plant, with new personnel. After these usual early production issues were solved, there is nothing less good about an M4-2 compared to an M4, although they are different. For instance, the replacement of brass gears with steel gears in the M4-2 film transport made the transport more durable but it does not have quite the "silky smooth" feel of the M4 until well worn in; a trade off. On the other hand, the M4-2 is less likely to need periodic adjustments and service than the M4 as there are fewer and more robust components in the usual areas of wear (the rangefinder coupling, the film transport, etc.).
Aside from this, the article is an interesting personal perspective on the Leitz Midlands production facility. I would like to see it correlated and corroborated with factual documentarian and historical research.
G