If you have light on the screen (heck even arcing off the 1B3 top cap) the flyback is fine...
Run the set with the cage off to determine exactly which to points the arc is jumping between and report back.
If it will not arc with the cage off because it is arcing to the cage then you need to clean the surfaces and area around the arcing points...Eliminate any sharp/pointy edges at the arcing points and possibly add insulation.
Pictures of the places it is arcing from and the condition of the HV cage and it's contents of will help in providing less general advice.
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