This step is a little bit tricky because the bolts & nuts are tiny, and it have some slack. Don't press too much the nuts. The PCB have to bend a little bit, but not too much. You should be capable of moving the display pushing the borders with your fingers. Later, when the screen is on, you will fine adjust the position for having the margins equalized.
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'''Note:''' Before fixing the screen, don't forget to remove the protective plastic sheet!