I was inspired by some of the posts about using a pole to tension the tie-outs on the bigger tarps, so I went by Lowe's and picked up a 10 foot section of the 1/2" CPVC pipe. I cut it in half, and used it to tension my DIY tarp. Just because I had them laying around, I used S-biners to attach the poles to the tarp. I plan to cut each pole into thirds, and use couplers to attach them for use on the tarp. I was really pleased with how this worked. The first night I did not use the tie-outs with rope, but the second night was very windy and I added the line on the tie-outs (although it seemed to be working well without the tie-outs, I didn't want to have to get up in the middle of the night if it became a problem). I like this mod because it is very, and very cheap. They tension very well, but not too much, and the pipe seems to handle the stress well.
I know people have been doing this with arrow shafts and with tent poles and such...I haven't seen it with CPVC yet and wanted to give it a try.
BTW the CPVC is the yellowish colored stuff as opposed to bright white schedule 40. I wanted to mention this because my pipes look white in the pics but are actually yellow.
p.s. if you look closely you can see the 30.06 shells I use in my marlinspike hitch. I am very proud of those.