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You really need a picture from one of the books, but I'll try.
The yoke goes anywhere for now. there are pole pieces on each gun. The convergence electromagnets go over these, not the sliding magnets. There is probably a coating on the neck blocking your view. Try to look up in there and see them. They might be under the pink stuff inside the neck (if you have it). In any event, look forward and try to see them. Center the convergence yoke over them, blue on top. They are the same thickness as the convergence yoke, so if you can see one edge of the pole pieces, you can figure it out.
Next comes the purity rings. They might have more plastic on one side than the other. I forget which way, but you can sort of tell because the rings I think. The extra plastic probably goes forward. The rings go over a gap between the elements of the electron guns. This is going to put them really, really close to the static convergence magnets.
The blue lateral comes next. there is a pole piece on top of the blue gun for this. The magnet is centered front to rear over this pole piece, but twisted to about the 2 o'clock position on the neck. If you have the blue lateral that turns, the short part thats through the bracket is what goes at 2 o'clock. If you have the bar magnet, the magnet goes at 2 o'clock. If you have the one with a little bump of a magnet strapped directly to the neck, start out at 2 o'clock, and adjust by changing the clock position.
If you have something in the wrong way, like the purity magnets, you probably cant get blue lateral forward enough to be over the pole piece. This stuff is really crammed together when its put on there by the book.
The blue pole piece is at focus voltage (6kv) with the set running, and the blue lateral is usually grounded. If you can maximize the distance between the blue pole piece and the grounded bracket by adjusting clock position, It's probably a good Idea. Probably only possible on the bar magnet kind.
All the best,
John
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