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In later sets after the damper circuitry had become standardized (damper tube in series with the flyback's B+ path), there was a little trick that was guaranteed to bump the width out a tad, while dropping the HV a corresponding amount. That was to take a disc ceramic cap of 82 mmf (82pf) rated at 4KV or higher, and connect it directly across the damper, cathode to plate.
Your set has a different damper configuration so i can't guarantee it would work, but it might. It might be worth a try sometime later if you have the chassis out for something else. It wouldn't hurt anything. Dropping the HV a smidgin would give a little more headroom for the arcy sparky 1X2.
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