I think maybe the "correct" way of mounting the mobo onto the raisers are using those smaller "plus" head screws (The ones used for mountaing floppy, hard drives, and optical drives)... but I didn't have enough of those, and they seemed too wobbly for this motherboard I'm using. So instead, I just used those bigger case screws (still plus) to screw the motherboard, and it seemed to did the job. Can you also mix and match? I only had one of those smaller ones, and plenty of the bigger "case' screws, so I used a combination of those. Is this okay? It seems much more stable with the case screws, however.