Be careful with this seemingly easy step. A few weeks after following this guide to replace my hard drive I noticed that something inside the Mac mini was loose and moving around. I was very annoyed but decided to open it again to have a look and it turned out the be the retaining clip.
I think I damaged it a little bit and it's not holding into place firmly like it is supposed to anymore. I wonder if I can remove it completely in case it happens again.
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