Rolling barrier system.
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Previously:
https://www.homemadetools.net/forum/...015#post217604
https://www.homemadetools.net/forum/...661#post209524
https://www.homemadetools.net/forum/...980#post198845
https://www.homemadetools.net/forum/...703#post139898
https://www.homemadetools.net/forum/...880#post190848