Ok folks, there is the miracules FS830 Frame:
For a first quick overview, it looks stabel and i can‘t detect any play n the link’s.
I opened all bearings, there is nearly no grase inside. 2 Bearings are maybe damaged, so i’ve to change them.
The Bearings are mostly in the Frame and the screwheads are big because the Conection Area is conical.
Pictures says more than words, so have a look to this: