I should have known you'd ask that. I don't know.
More than enough to push the spring up and spit water the same distance as heads beside them that are working.
A pinched swing line going to the head doesn't make sense on 40 some heads.
This is not a problem on one or two zones that the all the heads don't work. Its across the entire 180,000 sq ft.
Professionals are people who can do their job when they don't feel like it.
Amateurs are people that can't do their job even when they do feel like it.