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The barbs on that nipple look rounded over. Maybe you should consider replacing the whole unit. It's possible someone may have used a file on it already when they had the same problem you're having. Heating it up enough to stretch it that far is a bad idea. I would not take a chance with something so inaccessible and critical to staying afloat. Maybe you'll get lucky and the new threaded part will be the same as the old so you can leave the hull side on.