Go to post #33 of this thread and see the heel in the photo they exploded. The Look 3D system heels also exploded, I have had to put a few pair in the dumpster over the years.Only heels I ever had that exploded were the Marker Rotomat with the notched Simplex toe !
What year did they start the centering device for the heel? My first pair did not come with them but I did add them after the fact. The centering device sure made the binding easer to sell because around the same time the step in bindings were getting more sophisticated and skiers wanted things easer and easer. They wanted shorter skis, step bindings, and fewer buckles on a ski boot.SKI Feb 1974