Hydraulic penthouse doors activated by rain sensors.
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Previously:
https://www.homemadetools.net/forum/...001#post179822
https://www.homemadetools.net/forum/...369#post131305
https://www.homemadetools.net/forum/...057#post140978
https://www.homemadetools.net/forum/...059#post103138
https://www.homemadetools.net/forum/...001#post125290
