paul said:
You are wrong Alex.

They look live a "normal" nut but they are the ends of a threaded sleeve which creates the gap for the side plates.
Take a look at the tech pdf of the simple. There you'll see that is is not a normal bolt

Page 2
file:///C:/Users/leclused01/AppData/Local/Packages/Microsoft.MicrosoftEdge_8wekyb3d8bbwe/TempState/Downloads/technical-notice-SIMPLE-2.pdf