Why wouldn't the VIN pad be set up to be machined the exact same way everytime? They were not done by a hand grinder (like that looks like ) They produced in one plant at least a thousand cars a day so why would they not be done with a fixed milling process?
I agree. I would think all the surfacing, deck, oil pan, and top would be done at the same time set in a crank jig, even front and back surface. Moving from different machines would be hard to keep true.