Good size but very wobbly

While I like the overall size of this desk, it doesn't really fit my laptop very well (it is a bit small). Also, I tend to like to use a separate keyboard and the second shelf cannot be pushed in and out, so it is not as convenient as I would like. The main issue I have with this desk though is that it is very wobbly. I have tightened it multiple times and it just keeps loosening back up.

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