If your 3DS has bent pins it is possible to bend them back and still use your handheld. Keep in mind that the pins can bend again with use. Even break. At that point, a new card reader will have to be soldered on.
There are plenty of videos that show how to open a 3DS.
Tools
small philips screw diver
tri wing screw driver
tiny tweezers
91% rubbing alcohol
firm bristle tooth brush
electronic contact cleaner
a hope and a prayer

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