How the he-- do they fold it??!?

If you remember how critical the shape of the Hubble was, that the corrective optics were needed, to get a machine to align its parts to such accuracy, all remotely, must be a major challenge.

I recall reading an article on it before it was launched. It extolled its precision. It told about the "Teacup" defect that was discovered, agonized over, and cut out. The Hubble mirror has a hole cut through it to remove a defect in the glass that could have caused it to shatter if the defect was not annealed properly. They cut it out and discovered that it would have been fine. That said it was a marvelous piece of engineering, even with it being ground to the wrong shape.

I hope they left the testing budget alone so that this mirror doesn't have a similar fate.

What surprises me is they never built out the backup mirror and orbited it. Two Hubbles could have make an amazing interferometer.