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This is a mechanical problem for sure, the CRT is fine.
First be sure the Yoke windings are snug against the bell of the CRT.
That wing nut on top holds the centering magnet, if you loosen it and move it around you'll get the picture to center, I think you will find it not only turns but it slides up and down and sideways, it can be a pain to get right, my Philco with a 21EP4 uses the same setup.
Do not under any circumstances disassemble the Focus assembly, that is don't take out the screws and remove the magnets, it'll never work right again if you do.
If the focus adjustment won't turn freely just clean and oil it but don't take it apart.
There is some interaction between the Ion trap, Focus and the Centering so you'll have to repeat the adjustments to get it right, adjusting the Ion trap should be the last adjustment you make.
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