Those RCAs built along 630 lines all weigh a ton.
I see a new CRT anode lead in your future. Looks like HV arced through the insulation where it's supported by that long spring. My T-100 had the same problem.
In that photo the spring has been moved back from the chewed spot. I painted the bad spot with a couple of coats of corona dope as a temporary fix. The temporary fix worked so well that I never bothered to replace the lead, even though a new lead costs almost nothing. Laziness trumps perfectionism again.
Or maybe I'm misreading the photo and someone already cured your problem with some other kind of magic goo. In any case, I'd check out that thing that looks like a wad of brown bubble gum.
Phil Nelson