Either lost the plans for that part, or more likely the sub-contractor who made it didn"t keep the specialized tooling. Precision manufacturing is no small matter - even if you have the design specs, once the jigs, dies, etc are gone you have to do an immense amount of rework. This is why China is +20 years behind in jet engine technology - even if they have a modern engine for reference, figuring out how to duplicate the manufacturing process is very complex.
No, I'm not believing that. Those plans are all in the same place.
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