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PVC is so cheap. Just buy more than you need when you start. I did that, and when it cracked (once over 2 years of lots of use) you just pull the screws out, take the pvc, replace it and put the new one on. It took me like 10 minutes to replace. I have the 1 1/4 in pvc pipes. I would go with a bunch of smaller pipes.
the only way its going to crack and break like mine did is iff you drag your back foot and hit the end square.. yeah i accidently did that on a 270 on and that started the doom of my rails