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These sets have a lot of domino-style caps in the sweep and sync sections. I was just working on one today, and it had jumpy sync, so I bit the bullet and just replaced all the mica and mica-like caps in the board near the sweep circuitry (I left the micas in the RF and IF sections, which I generally find don't need attention nearly as often). This solved my problem completely. You may simply want to do the same thing in your set, at least for all the mica caps directly involved in the horizontal sweep. There are probably something like 8 of them in that circuitry. Overall, I replaced something like 17 (!) mica and mica-like caps today in the entire sweep and sync sections.
Note that not all of the mica-like caps in the sweep section are low pF. I replaced a number in the 1000 pF, 3900 pF, and 6800 pF range as well (these are the larger rectangular caps).
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