It was just a passing thought
On a more real note, how about some slotting or milling to see the ball count? Anyone down with that? I'm also with pk5, on the note about a shorter feed tube for the top(the back part). Or perhaps a feed gate on the rear with little nubs to make a cram-n-jam for those that run that way.
I personally like having a feed gate. Dump the tube in then dispose. Easy enough I guess.