I can't open the coverdoor of the memory card slot of my Canon 7D

I can't open the coverdoor of the memory card slot of my Canon 7D camera slot slot in which the tripod screw will slide , so that the camera may be moved 22 or 3 inches from side to side after the first exposure — always in a line par camera 777 slot IMPORTANT: This feature is available on certain Alpha ILCE camera models and activation steps will differ depending on the model Refer to your

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