Many vintage TVs have an adjustable coil that sets the free running horizontal oscillator frequency. It's usually at the back or under the chassis and acts like a coarse horizontal hold while the horizon hold at the front of the set is used for minor corrections.
It appears that yours does not. It only has a single horizontal hold control. That makes me think that component values are especially critical.
Particularly C513, C516, C517 and L501 in "SECTION 5 - SWEEP"
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