The flyback definitely cannot be repaired.
I cleaned out the blast hole, removed the burnt carbonized plastic and deposit next to it. I melted a piece of the same type of plastic into the hole and spread it evenly so it was completely sealed then wrapped it with multiple wraps of Scotch self-sealing high voltage insulating silicone rubber tape used for taping high voltage substation transformer connections, reconnected everything and turned the tv on. Immediately, there was a high pitched screech and an arc appeared exactly where it had been before, the high voltage had punctured the same place in the flyback housing.
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