There is supposed to be a center bolt that goes all the way through all of the leaves in the spring pack & also keeps the spring pack centered on the axle. That center bolt obviously broke in addition to the clamp. The clamp only keeps the leaves from pivoting around that center bolt. The center bolt and the u bolts are what holds the whole spring pack together.
https://www.generalspringkc.com/how_...olt_s/3153.htm