A Confession

[DaveWM]

in the hot wax video you can hear my commentary about running a low voltage DC current to cook out on a really hard to find (like a CT-100 fly) and or doing the desiccant low heat alternatives. On flys that are not as hard to find I just tend to leave them be unless there is a problem. The idea of short term use makes since, both the internal heat and heat from tubes would be good. However if there is a chance the set has seen high humidity (which is always a chance since we rarely know the complete history) then I think at a minimum the FLY should be cooked slowly (FLY jerky) to dry it out before use and restraint on sealing it up least the moisture be trapped.

I hope the OP will open it up and see if he can find a carbon trace, there is still a chance the fly can be salvaged. If not the quadrupler (pretty sure you would need that vs a tripler) may work.