FFR gave me 8 phillips head screws, all of which are narrower than the four main holes in the FFR electric fan, to mount the metal strips to the fan. They didn't give me any nuts, and nuts aren't listed in the inventory packetl; all I have are the screws and some funny looking washers that are supposed to go on them. The screws don't look like the type that accept nuts anyway. However, the manual says to use "flat nuts" for them. How do you use these narrow screws to attach the fan to the strips?