[0]https://www.esmats.eu/amspapers/pastpapers/pdfs/2006/warden....
But let's assume you are right: Then how does the blue gear at top of the lead screw simultaneously turn the shaft and move upwards too?
The sensor and stabilizer on the right side are flexible.
https://en.wikipedia.org/wiki/Ball_Corporation
That move was made on account of the Indian Gas Boom, which ran from the 1880s through the early 20th century, when it was discovered that there were large reserves of readily-accessible natural gas to be found in Indiana in field generally centered around Muncie.
As with other natural resource extraction booms before and since, proponents argued that the resources were inexhaustible, that prospectors had freedom to use or waste the resource in any way they saw fit --- large natural torches called flambeaux were a frequent sight. Over 90% of the gas was ultimately wasted, vented to the atmosphere.
The boom died out in the first decade of the 20th century.
https://www.nasa.gov/feature/goddard/2017/aligning-the-prima...
> To measure the shape of the Webb telescope’s primary mirror, engineers use a test device called an interferometer, which shines a laser down onto the mirror.
The next phase you’re referring to also uses a laser, but this time it’s shone off the mirrors into the actual scientific observation sensors, hence they describe it as being used as a source of artificial starlight.
On the ground, you can easily place a laser in an optically identical position as a star (near infinity). In space, I don't think this would be possible, since it would require that the laser, and the optics that would be required, would all be within a fraction of a wavelength of the true optical path. In the end, you would still need to align to a star anyways.
Interferometry works just fine with starlight.