It's the one butted right up to the bell of the tube. There's a radiator hose type clamp that holds it in place. Loosen it, and you should be able to rotate the yoke, but there's usually sticky tape between the yoke and the tube neck for friction, and the yoke and tape usually are badly bonded by now, since they've been paired for about 25 years.
You can either forcefully rotate the yoke, and it will usually snap free of the tape, or you might need to take all the magnetics off the tube by partly pulling the tube out from the front, and sliding a small straightblade screwdriver between the yoke tabs and the tape, which will break the bond.
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