Ok I recall that. “Unfortunately” Framework had decided to go for the “clamped steel” version:
rather than the “bolted” version (note the exposed hex nuts)
You can still use things like a desk vice (or a press) to squeeze the “collar”, although it’s much more difficult to do and harder to control.
Looking at their current hinge I think we need to redesign the shape of the mounting plates as the current one has no place for pressing together the two springy plates (black disks in 2ng pic) or for the tightening nut.