Had to smile at that one! I use to use 3' tubes too......my ceiling above my press is only 7' high though. so my upper support was a hole in the ceiling....that was the lateral support! But then jmorris demoed his kit-made 3D printer, and how it could make cheap electric collators. The rest is history.....
I bought one commercial one....the Hornady pistol bullet feeder, but it was so dang inefficient, that I had to spend a lot of time and effort just to make it empty faster.....still use it, but my other presses all have 3D printed ones, 4 so far, and they work better and are so stinking inexpensive. Just have to buy a printer....
then it just keeps on giving.....I'll probably print one more.