When did I say that manufacturers lacked measuring equipment? I don't remember saying that. All I meant is that with a single sample of a lens there typically won't be anything to adjust other than focus' reference to infinity.

Basically there's no way for a user to adjust alignment of elements if the lens barrel assembly has zero facility for doing so. The only thing the user can do is follow strict disassembly/assembly protocol. I think that's a pretty sane assertion.

The whole point of this thread is in breaking down the bullshit protectionist mysticism surrounding camera and lens maintenance.