uniserver said:

pretty sure the sealant melts due to Fumes from the 9v or Lead Acid battery.   because they use those same HD's in Classic and LC, they never goo up like that... only the portable.

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That is quite possible. Those old type of batteries had "vents" to release gases if the reaction went bad or they started to get old and started out gassing from inappropriate reactions that take place when they just sit there without being used.