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This is why I always use the utmost of caution when working around the horizontal section of these sets, if you fry the flyback it's impossible to find another one. That means you'll probably end up using a completely different flyback if the one you have can't be repaired.
It's not coated in rubber BTW, it's wax. I just repaired a flyback from another set by replacing the wax, see my thread on the Gilfillan prototype. Use extreme caution around the tiny wires of the HV winding, too much heat can melt them. I used a soldering iron to carefully melt the old wax off, then used a silicone mold to cast the new section from a negative of what was still there of the old section. Electronics safe RTV works too, I was trying to go for originality because my flyback has a rectifier string around the outside of the tire. You could also put a piece of phenolic over the metal section of the cage it arced to, that would help keep any stray HV to a minimum.
Good luck, it's not an easy job.
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Evolution...
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