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Also it is much easier getting the fan correctly aligned on the stand of rubbery bit if you have the screw removed.
There is a grove in the casing that might be difficult to align. If so use gravity to allow the power unit to fall into "place".
I used two 2.5 mm drill bits, turned upside down. They worked like a dream. It took me a little while to realize that they needed to be lifted slightly from the underlying case in order for the board to slide out.