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Yes - I have done the blanking modifications on many electrostatic sets like yours (most recent case yesterday, on a Hallicrafters). All you need to do is add a 100 K resistor between pin 3 (control grid) of the CRT and its existing connection to ground, and then connect a 150 pF 1 kV minimum ceramic disk capacitor from the CRT pin 3 to either pin 2 or pin 5 of the 6SL7 vertical oscillator tube. Try both pin 2 and 5 (the two anodes) -- one of them will fix the problem, and the other will not. Leave it connected to the one that fixes it. If you have a scope, you can identify the right pin by choosing the one that has a rising sawtooth with a vertical falling waveform. The other will be the opposite. If the circuit you found is correct for this particular set, pin 5 is the one. The values of capacitance and resistance that you note above will also work OK - you can try those values if you like.
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