1. The screw must pass through the the slot (A) fit, otherwise the tray not up if the screw is in it.2. The hole in the tray for the screw must, of course, a slit to the waist.3. screw in the (Pink) sides screwed, the screw terminal has a chest so that the screw the tray does not lock (otherwise you would not be able to take out the tray)
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