The basic concept was really easy to replicate, but I couldn't figure out how to (easily) attach the tubes together. I tried attaching them with a couple stitches through the cardboard but that just wasn't going to work, never mind how to make sure each tube was perfectly lined up. I had the sudden brainstorm of using paperclips, which hold well and will allow it to be dismantled. Next year I might try and see what I can use that is even sturdier, like those wide metal clips that you slide onto paper with a little tool - they'd be really good although a more expensive option!
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