I've read the FAQ and several designs but i can't see how to hang the canvas in the slot. What keeps it in there? Right now, i just have some zip ties holding it against the pipe, but i don't see many people using those. Are they folding it over in the pipe or gluing something to the top edge to get it to stay in there?
My distribution pipe is 26" long, so i have 2 sheets hanging side by side.