I don't know if anyone is interested, but this is what I did to my APP press. I used a block of nylon and drilled holes in it to hold the tubes with a small lip at the bottom. I just set it up for the medium sized tube and the 2 big ones. I have no plans at this time to use the smallest tube. I made it so I can adjust without a wrench. I used carriage bolts in the slots. It is shown using the medium tube and to use the 2 larger tubes, I just flip it over. The larger tubes have about the same OD, so they use the same hole.