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There's a critical difference between knowing what goes where for assembly, and having exact schematics for each and every single one of the thousands of unique components
additionally, NASA didn't build the components, contractors did, and not all of those contractors still exist
jigs and fixtures do cost money to build, maintain, and store when not in use, and there's no fucking incentive to keep that tooling for fucking decades after all sales of the part have permanently ceased
goddamn tragic that /pol/ is overrun by well poisoning jews and literal children