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Hi Phil;
When I worked on my Predicta's, I ran into the same issues that you're now facing. My conclusion about the horz. centering was that the little flat disc magnets used for centering have lost some of their magnetic pull and will never work as well as they did when new. And you're right about the horz. linearity, it's just a matter of bending the arm assembly around to find the "sweet spot". It seems like a real half baked way of doing it, but this whole set kind of leans in that direction.
Like you I also went to battle with that darned difficult to release spring in the neck base. I discovered the easiest way to put the face and band on and take them off is to leave the spring attached in the base and carefully spread the band around the face of the tube cover and slowly work it into place. The spring will give enough to allow the band to go over the little ears. When I remove the face, I go in reverse and pull the band up over the ears and slowly pull it off. It seems to work quite well for me.
I don't know that I've ever seen a 21" Predicta with a picture that is free from some type of geometric distortion (including mine). The smaller 17" sets seem much better.
Good luck.
Bob
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