A system for assembly between a first sheet of glass including a countersunk hole on each of its sides and a second sheet of glass also including a countersunk hole on each of its sides, each countersunk hole configured respectively to take first and second connecting pieces made of two elements making it possible, by clamping the elements, to introduce a preload into the countersunk hole, each of the first and second connecting pieces being provided with a bore, the system comprising:
- a connecting core connecting with the first and second connecting pieces, wherein the connecting core comprises first and second parts, wherein the first part mates with the surface of the bore of the first connecting piece on which it exerts a force roughly parallel to an axis of the hole and the second part fits into the bore made in the second connecting piece therein to react to the force.