Thank you very much, iFixit team! The procedure worked just to me!
This screw is very short, when I tried to put it back, the beginning of its thread got dusted and now it's impossible to use it to fix the bracket in place. It should be 3.5 mm instead of 2.6. Nevertheless, the SATA connector is firmly attached to the logical board withou screw+bracket and my mac mini is working nicely.
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