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I think the square one is for positive for most of the plugs out there. But there are some plugs are wired the other way.
You may want to go the common way... Or go the opposite way with ALL of your plugs on all the guns/batteries/cables you have.
You may need a Tamiya Plug Pin Removal Tool, or you can go with the method above.
Wait, if the polarity is reversed on the banana to tamiya adapter... Can you just switch the two banana plugs till you get a pin removal tool?
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