Who has it and how did you rig yours up. I started working on one awhile back modeling it after one I saw on pirate, 2.5" copper tube and supposedly it has 3/8 inside it. well I have a piece of 2.5" copper tube and a roll of 3/8 soft copper tube but I can't seem to get it to roll tight enough to fit. I don't want to go any smaller due to lack of volume. So how did you build yours?