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If this is the chassis that I'm thinking of, it has a plastic rod that slides in/out of the focus coil to adjust. Also common and simular on the early 25" sets. Common for flybacks to cook on these too, I've replaced a few back in the day. I've seen those focus coils burn up too. Make sure that the Boost Rectifier is good also as a precaution!
I did a flyback job on one kinda like yours, with it's original RCA "hi-lite" CRT and that thing produced a beautiful picture. Nice sets!
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