Metal housing towards tip of pen pops off when writing

The design is good, but the execution is off. I am rating this 2 stars because the metal housing towards the top of the pen often pops off when I write for extended periods of time. Admittedly, I probably apply more downward pressure on the pen when writing than most, but I find that I often need to stop writing and push the housing back to avoid it shooting across the desk.

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