DC tac hook up..?..

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So I took the 5/16 nuts off the back and basically nothing LOL the inner guts seem to fall forward a little and the post sinked in a little bit but I turn it upside right and they poke out it just moves the inner guts but I don't really see how there's any way of getting into it.. it kind of looks like permanently sealed or something as the front is kind of crimped around...