Does anyone know what size and type of screw are used for the Magic Pie 5 ? I need 3 screws and the heads are starting to strip. I can put them in, but I don't think I will be able to get them out again. So I would need a set of 6 screws. We have a fastener store nearby, but it's cold outside and I don't want to stand in the cold while I wait for them to go find my screw. It's easier to know what I need and order it ahead of time.