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Polarity does not matter but it's better to do the soldering when the heat can't reach the innards of the cartridge. In other words, before you slip the terminals on.
Sometimes there is a ground side of the cartridge, which has a lug that connects to the metal body. Other than that, there is no polarity.
You can tell which is 78 with a jeweler's loupe or good magnifier. It's triple the radius of the long play side, much fatter.
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