Another great product for making rod tubes is central vac tubing available at any large building supply outlet like Home Depot etc. There are even snug fitting end caps available to seal up the ends. What I do is cut the pipe to length, wet sand it with about 600 or 800 grit to make it shiny and slick. Glue the end cap in place for the bottom (put some closed cell foam in the bottom of the cap for rod protection) I then drill a small hole in the top cap (perfectly centered) and another in the side of the tube. These are done to connect the top cap to the tube with a piece of small diameter rope. Central vac tubing is made up of the same material as the PVC mentioned above (at least I think it is) but it has thinner side walls. It's still very durable however. I have found it in white and grey colors. It's pretty cheap as well. A 12ft length cost me about $10.00 and the matching end caps were $0.50 a piece.
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