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also you can use PVC cement to patch it back up if there was just a small weak spot
ABS is brittle in cold weather. i hit my set up that i hit most of the summer (which didnt break in the summer) for the first time in the winter and it cracked within 2 runs
make sure it has a solid core, some are filled with yellowish foam between super thin layers of pvc. it'll break right away. also build your rails so that you can take the pvc off cause it does eventually break after years of constant use or if a tree falls on it or something