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When your Raspberry Pi 2 is does not hold the integrated sd-card anymore, than your one of many people who face the same problem.
I have found an easy way to repair the sd card holder without fire and iron and explosions:
You can use an elastci strap and you will only loose 2 of your 4 USB-slots with this method.
A small and strong elastic strap can hold the sd cartd in the sd card slot and fixes the problem easily and smooth.
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The Result
Your Raspberry Pi works again without any problems.
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Alternative repair
If you want to repair your sd-card slot like a pro, you should watch this youtube video:
Last alternative
Buy a new Raspberry 3 model: