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Is this for a dobsonian? If so, you don’t really need a round tube. Square, octagonal and hexagonal tubes work very well. I’ve made several octagonal tubes, you can find examples in the archives. The advantage is you don’t need a tube box so the mount is a little smaller and lighter.
Sonotube/form tube works very well but you often can’t get a small offcut and the complete length can be expensive. What size are you after?
Rod.
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