Introduction
I did not do any big repair, but I did drop it the day I got it and accidentaly put the black parts together without the white one that moves the blades. Afterwards I wasn't able to take it back apart, and was afraid I will break it. To remember this later and to help out others I thought I'll document the inner parts of what I saw
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The beard trimmer is connected with small plastic hooks.
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Two hooks are fixed on the top part of the smaller part, that should be removed last, since the cannot be clicked out
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The rest can be seen on the images
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Conclusion
To reassemble your device, follow these instructions in reverse order.