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If you are reusing all your OEM fans and screws and you have one of the original Hero Me Gen2 bases: You would use 2 of the long thin (M2) screws to hold the cooling duct to the Hero Me base. You use the other two long thin screws to hold the OEM 4010 fan to the cooling duct. You use the M3 screws to hold the fan to the base that cools the heat sync. If you are using one of the newer Hero Me Gen2 bases, the holes on the sides for mounting the cooling ducts are now sized for M3 screws. I am standardizing everything around M3 screws going forward. The holes in the Hero Me base (of either size) are meant to be self tapping, no nuts are needed. Depending on how your Base print turned out, you may need to use an Xacto knife to widen the oval hole in the cooling duct pegs to allow the M3 screws to fit through.