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I will try to simplify and summarize in a simpler way. Anyone who believes that a mis-adjusted ion trap will not damage the face of a crt is sadly mistaken. All repair manuals of the time HIGHLY stress this, and they are what I used to find in the library as a kid. Needless to say, I have always been careful with the adjustment of the ION TRAP magnet. I think if you try to think too deeply into the engineering theories of the monochrome cathode ray tube, then it just becomes too confusing.
Just follow the instructions in any good old manual and everything will come out fine. Old TV manuals show up a lot in Goodwill stores with bookshops in them.
The best advice I could give anyone here that is new to the ion trap is: if you remove one, mark an arrow pointing toward the faceplate of the crt. This is so the polarity of the magnetic field will not be reversed. Take a FINE sharpie and just trace the positioning of the magnet on the glass of the crt neck. Then take a telescopic look down the gun and take note of the clock positioning of the magnet. This way you can't go wrong.
Now it's a whole different story when you run into a situation where the magnet has been disturbed and is out of place or missing. Maybe we could make another thread out of that.
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