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The focus coil also effects centering. If there isn't additional centering controls on the set the general idea of the he focus coil is adjust for best focus, try to get centering as good as you can and avoid corners getting neck shadow from the focus coil adjustment.
The first thing I would do is adjust the vertical pots to get the vertical linear. If you can achieve that and have sound, then slide the chassis into the cabinet and adjust the sweep (and possibly focus and trap) with the cabinet mask present. The mask will tell you if you have too little or too much deflection, and if you're centered.
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