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The drive control is almost always a variable capacitor and typically doesn't adjust the frequency.
The horizontal osc coil usually has 2 adjustable ferrite slugs that set the frequency and waveform of the horizontal osc.
On the RCA synchroguide circuit if it's way out to lunch (which is sometimes exacerbated by a restoration as repairmen may have adjusted it to compensate for a drifting component you replaced) I typically use an oscilloscope to adjust it so that I know the waveform is OK, and so it'll be synched up perfectly next time I install the chassis.
Basically I scope a composite video signal, get 2-3 sync pulses on screen, count the divisions between them, don't touch the timebase of the scope again, scope the horizontal osc in the TV and set the peaks for the same number of divisions separating them and adjust waveform so the peak is slightly higher than the hump.
You can eyeball it, especially when it's as close as you have it, but nothing beats having it set perfectly with the aid instruments.
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