Early cush drive sprocket

Hi peeps,
Can anyone enlighten me please.
In Sticky's manual he states cush drive sprockets can fail. What does this mean? Do the rivets holding it together break or is there other components hidden under the internal plate break?
Super
Can anyone enlighten me please.
In Sticky's manual he states cush drive sprockets can fail. What does this mean? Do the rivets holding it together break or is there other components hidden under the internal plate break?
Super