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From the very beginning (a year ago) the original Hero Me designer (Kelokera) created the 5015 single and described in his make that only one M3 screw was needed because the bottom lip of the duct air intake will hold the fan in place on the other side. When I designed the first dual 5015 fan duct for the Hero Me, the fans had to be moved forward to allow the left fan to get enough air on the intake. It was by chance that I moved it the right amount forward for the fan's back mount hole to line up. There is no way to properly afix a M3 screw through that hole and have it hold in the rear mount peg. That slot is only for mounting the fan duct to the Hero Me base. Sorry for the confusion.