The plate cap is easy to change. The metal cover under
the HV rectifire door comes off with three 1/4" bolts.
The FBT board is there & the focus components.
Most purity rings come with the blue lateral also. You
can take one off almost any delta tube. Newer Zeniths
use a very nice one. IF you change the jug see if you can
find a newer chroma color. It will look much better.
Livestock in TV's were a big problem. Once I opened a set
& a roach as big as a Buick came walking out. Two of
us unloaded on it with freeze mist. Damn thing pulled a
Walt Disney a half hour later, flipped over & started walking again !
A hammer finnished the job.
73 Zeno