"The glaring hardware faults on Hubble derive from a case of engineering myopia, a clear and steady failure to heed the bigger picture. For example: telescope optics machined improperly and tested inadequately by overconfident engineers, with no meaningful technical or scientific input from outside the secretive contractor . . . [and] the incorporation into Hubble of used goods, such as decades-old gyroscopes [gyros that had been tested for some 70,000 hours before use in the telescope—‘tested to death,’ as one engineer stated] and memory boards meant for antique space vehicles."
January 1, 1970
https://en.wikiquote.org/wiki/Telescope