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Sounds like a sync problem. I'd check any caps in the sync separator circuit, and from there to the horizontal oscillator circuit. As far as the horizontal hold control, it's usually a coil with a slug on Zeniths; not a pot. I don't know that exact chassis, but it might be on the back with the slug broken off, or white plastic shaft missing. That happened a lot because people would jam the back onto the set and be careless with threading the horizontal hold shaft through it's hole in the back cover.
Charles
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Collecting & restoring TVs in Los Angeles since age 10
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