That was how a broke my hopper twice and finally bought the upgrade kit as my LGS was sold out of the others.
That is an interesting point about the shell holder being missized for 9mm, perhaps would explain some of my frustrations.
I really wanted it to work for 38 special, but personally I couldn't get the case feeder, primers reliably feeding, or auto eject to work without constant tinkering. I am known to get frustrated with tools like this so my wife wisely suggested I look else where. I have seen plenty of videos and heard personal praises of th working fine, just wasn't for me no hard feelings.