You will need a small peace of foam in order to keep display in place.
I used the tesa powerbond (remove protective film only from one side).
WARNING: WHEN INSTALLING HYPERPIXEL 4.0 RECTANGLE ONTO YOUR PI MAKE SURE NOT TO PRESS DOWN ON THE SCREEN SURFACE! HOLD THE BOARD BY ITS EDGES AND WIGGLE IT TO MATE WITH THE EXTENDED HEADER (OR GPIO HEADER). ALSO TAKE CARE NOT TO PULL ON THE EDGES OF THE GLASS DISPLAY WHEN REMOVING YOUR HYPERPIXEL.
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