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That is the right thing to be adjusting, not sure why it's not responding but basically it has to mean the yoke isn't turning with it as it should.
As earlyfilm suggested you could watch that red wire visible through the gap and see if it moves. You could even poke something non conductive through there and give it a poke and see if it's loose or not, very gently though.
The last resort is to remove the focus and centering assembly off the back and see what's wrong, that's a royal pain though.
Two words of caution, do not take the focus assembly apart, that is don't remove the screws holding the magnets together, once apart it may never work right again.
Second is those cloth straps will be rotted, on mine just the slightest sideways tug was all it took to rip one completely off.
This picture may help you see what you are dealing with, the slotted metal bracket is, as far as I know, attached to the core of the yoke so if it turns the yoke should also turn. I suppose it might be possible for it to break loose somehow.
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