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X11 does not feed the horizontal deflection circuit. The horizontal deflection circuit feeds X11 and Q6 to develop the AGC voltage. (X11 protects Q6 from the negative part of the pulse waveform). So, no modification is needed here.
You need to connect inverted video to point B (base of Q4). The average DC of the inverted video should match the 7.5 volts shown on the schematic. The part of schematic you posted doesn't show what the peak to peak video should be. Does your service info show a waveform for point B?
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