This is my design to fix the old Hornady/Mark7Reloading Case feeders.  Prevents the jam and brass waterfalls by taking up the space.  The fix was to create a cardboard spacer, but I could never see through is so sometimes a jam would happen and fixing was hidden.

This is just a similar 3d version of my cardboard cutout, it hangs on the case feeder funnel and  reduces the amount of brass movement before entering the feed tube.