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The condenser is filled with an insulating material that was poured into the casing as a hot fluid. So the insulating material has a relatively low melting point. Original condensers and early repros had wax in them. The current repros are superior, and I suspect it is because the insulating material has a higher melting point.
Failures of condensers is not a common occurrence these days as it was many years ago. My thought is that the exhaust manifold may be running unusually hot. Perhaps the fuel mixture is too lean, or the ignition timing is retarded. Also, those heater manifolds may cause condenser failures.