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I would not touch it without a raster on the screen, an oscilloscope, or an ear that can hear H-Osc. whistle in TV's and accurately tune for the right pitch.
With the scope you can adjust the osc accurately, by looking at a composite video source, getting ~2-5 H sync pulses on screen, counting divisions between them, then connecting the scope to the H osc in the TV and adjusting the H coil in the TV till the peaks of the wave form are at or close to the same distance you measured earlier...If it is a synchroguide based osc you should adjust for roughly equal peak and hump height too while your at it.
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