Finite Elemente Cerabase vs Symposium Rollerblocks

I have the Finite Elemente Cerabase Classic, and wondered if anyone in this thread knows the answer to my question -

These footers have a small hole near the base, with a screw poking out. What is the purpose of this screw and what should I do with it? I can just pull the screw out so it doesn't seem to be screwed in.

I'm not sure what you mean by "insert the screw footers". The footers have a hole (with a screw in) on the side. I don't think you could connect a component to the side of the footer.