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There is (or was) a long piece of stiff Fish paper under the Ion trap and extending to the end of the metal shield over the CRT neck, this is used for adjusting the Ion trap.
The traps are so weak you won't be able to feel the magnetism, in fact they are so weak you may not be able to get a raster unless the metal neck shield is in place.
The plastic yoke cover is always rotted away on these sets and the centering magnets are usually left hanging. there is a clamp with a single screw that holds the yoke against the CRT, the cover would have had serrations so you could reach through a hole and rotate the yoke with a screwdriver, then you tighten the screw to hold it. (this is all from memory so I may be off on a few details).
There is something between the centering magnets, I thought it was a piece of brass but it could be paper I guess.
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